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This marble mosaic circular panel is found on the floor of the St. Vitale church in Ravenna, Italy.

Marble Mosaic Circular Panel

This marble mosaic circular panel is found on the floor of the St. Vitale church in Ravenna, Italy.

The Renaissance circular panel is a bas-relief design found on a tomb in Venice, Italy.

Renaissance Circular Panel

The Renaissance circular panel is a bas-relief design found on a tomb in Venice, Italy.

The Renaissance circular panel is a majolica tile (Italian ceramic) found in Sienna, Italy.

Renaissance Circular Panel

The Renaissance circular panel is a majolica tile (Italian ceramic) found in Sienna, Italy.

The Renaissance circular panel is a German design made out of wrought-iron.

Renaissance Circular Panel

The Renaissance circular panel is a German design made out of wrought-iron.

The Renaissance circular panel is a majolica tile (Italian ceramic) found in Sienna, Italy.

Renaissance Circular Panel

The Renaissance circular panel is a majolica tile (Italian ceramic) found in Sienna, Italy.

This Renaissance circular panel is found in a church in Kamenz, Germany.

Renaissance Circular Panel

This Renaissance circular panel is found in a church in Kamenz, Germany.

This Renaissance circular panel is a German design.

Renaissance Circular Panel

This Renaissance circular panel is a German design.

The modern circular panel is a silver plaque design found in Berlin, Germany.

Modern Circular Panel

The modern circular panel is a silver plaque design found in Berlin, Germany.

The modern circular panel is a French design found on a ceiling staircase.

Modern Circular Panel

The modern circular panel is a French design found on a ceiling staircase.

An illustration of a lotus decorated capital. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Lotus Capital

An illustration of a lotus decorated capital. In several traditions of architecture including Classical…

An illustration of a papyrus decorated capital. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Papyrus Capital

An illustration of a papyrus decorated capital. In several traditions of architecture including Classical…

An illustration of a lotus decorated capital. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Lotus Capital

An illustration of a lotus decorated capital. In several traditions of architecture including Classical…

An illustration of a Persian capital. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Persian Capital

An illustration of a Persian capital. In several traditions of architecture including Classical architecture,…

An illustration of an early Greek capital. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Early Greek Capital

An illustration of an early Greek capital. In several traditions of architecture including Classical…

An illustration of a Corithian capital from the Tholos of Epidaurus. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Corinthian Capital

An illustration of a Corithian capital from the Tholos of Epidaurus. In several traditions of architecture…

An illustration of a Byzantine capital from the central portal of St. Mark's Venice. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Byzantine Capitals

An illustration of a Byzantine capital from the central portal of St. Mark's Venice. In several traditions…

An illustration of a Byzantine capital from the the Church of St. Vitale, Ravenna. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Byzantine Capitals

An illustration of a Byzantine capital from the the Church of St. Vitale, Ravenna. In several traditions…

An illustration of a Byzantine capital from the the Church of St. Vitale, Ravenna. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Byzantine Capitals

An illustration of a Byzantine capital from the the Church of St. Vitale, Ravenna. In several traditions…

An illustration of a cushion capital. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Cushion Capitals

An illustration of a cushion capital. In several traditions of architecture including Classical architecture,…

An illustration of a Romanesque capitals from the cloister of Monreale near Palermo, Sicily. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Romanesque Capitals

An illustration of a Romanesque capitals from the cloister of Monreale near Palermo, Sicily. In several…

An illustration of a Gothic capitals from Wells Cathedral. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Gothic Capitals

An illustration of a Gothic capitals from Wells Cathedral. In several traditions of architecture including…

An illustration of a Gothic capitals from from Amiens Cathedral. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Gothic Capitals

An illustration of a Gothic capitals from from Amiens Cathedral. In several traditions of architecture…

An illustration of Italian Renaissance capital from St. Maria dei Miracoli, Venice. In several traditions of architecture including Classical architecture, the capital (from the Latin caput, 'head') forms the crowning member of a column or a pilaster. The capital projects on each side as it rises, in order to support the abacus and unite the form of the latter (normally square) with the circular shaft of the column.

Italian Renaissance Capitals

An illustration of Italian Renaissance capital from St. Maria dei Miracoli, Venice. In several traditions…

"The most important and most beautiful of circular buildings without columns surrounding it is the Pantheon at Rome, which was completed in the reign of Augustus, in the year 25 A.D."

Façade of the Pantheon at Rome

"The most important and most beautiful of circular buildings without columns surrounding it is the Pantheon…

"The most important and most beautiful of circular buildings without columns surrounding it is the Pantheon at Rome, which was completed in the reign of Augustus, in the year 25 A.D."

Interior of the Pantheon at Rome

"The most important and most beautiful of circular buildings without columns surrounding it is the Pantheon…

The construction of arches and vaults did not remain confined to the interior of buildings, but imparted its own expression to the architecture of the exterior also; for the shape of openings became circular instead of square, although they were surrounded by half-columns gave a rectilinear finish to the whole.

Architecture of the Colosseum

The construction of arches and vaults did not remain confined to the interior of buildings, but imparted…

"Elevation and Section of the Tiers of Seats and Substructure of the same from the Colosseum at Rome. The whole mass of the rows of seats was supported by a solid substructure of piers and arches, which formed passages of three stories one above the other, retaining the circular form of the building; whilst externally they formed arcades, which were surrounded with half-columns or piers with entablatures over them. The exterior of the straight portion of the building, which contained the stage and some chambers connected with it, was generally surrounded by a portico. The theaters were either open, or were protected against the sun and rain by an awning stretched over them."

Elevation and Section of the Colosseum

"Elevation and Section of the Tiers of Seats and Substructure of the same from the Colosseum at Rome.…

An illustration of a sectional view of a Acanthobdella, a member of the annelid family. "c, Coelom; c.ch, Coelomic epithelium (yellow cells); cg, glandular cells; cl, Muscle cells of lateral line; cp, Pigment cells; ep, Ectoderm; g, Nerve cord; m, Intestine; mc, Circular muscle; ml, Longitudinal muscle; vd, Dorsal vessel; ww, Ventral vessel." (Britannic, 1910)

Sectional View of Acanthobdella

An illustration of a sectional view of a Acanthobdella, a member of the annelid family. "c, Coelom;…

An illustration of a sectional view of a Acanthobdella, a member of the annelid family. "c, Coelom; c.ch, Coelomic epithelium (yellow cells); cg, glandular cells; cl, Muscle cells of lateral line; cp, Pigment cells; ep, Ectoderm; g, Nerve cord; m, Intestine; mc, Circular muscle; ml, Longitudinal muscle; vd, Dorsal vessel; ww, Ventral vessel; cn, nerve cord; nf, parts of nephridium; on, external opening of nephridium; ov, ova; t, testis." (Britannica, 1910)

Sectional View of Acanthobdella

An illustration of a sectional view of a Acanthobdella, a member of the annelid family. "c, Coelom;…

"Section of the Church of S. Constantia at Rome. The simplest desctiptions of this kind of building are the baptistries, for which the ancient Thermæ furnished models. They generally have a circular or octagonal ground plan, a main space covered with a round or polygonal dome, and a circular passage separated therefrom by pillars in the same way that the side aisles are separated from the main aisle in basilicas. Sometimes they were without this passage, and only had galleries running round the interior like boxes in a theater. These buildings were generally constructed in the vicinity of cathedrals.

Santa Costanza

"Section of the Church of S. Constantia at Rome. The simplest desctiptions of this kind of building…

A barrel vault, also known as a tunnel vault or a wagon vault, is an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance. The curves are typically circular in shape, lending a semi-cylindrical appearance to the total design. The barrel vault is the simplest form of a vault: effectively a series of arches placed side by side, i.e., one after another.

Barrel Vault

A barrel vault, also known as a tunnel vault or a wagon vault, is an architectural element formed by…

"Diagram of an Echinus (stripped of its spines). a, mouth; a', gullet; b, teeth; c, lips; d, alveoli; e, falces; f, f, auriculariae; g, retractor, and h, protractor, muscles of Aristotle's lantern; i, madreporic canal; k, circular ambulacral vessel; l, Polian pedicels; r, r, spines; s, tubercle; s', tubercle to which a spine is articulated; t, t, pedicellariae; u, anus; v, madreporic tubercle; x, ocular spot." -Whitney, 1911

Sea Urchin Section

"Diagram of an Echinus (stripped of its spines). a, mouth; a', gullet; b, teeth; c, lips; d, alveoli;…

An illustration of the inflorescence of the field scabious. Knautia arvensis, commonly known as Field Scabious, is a species in the genus Knautia. It is a perennial plant that grows between 25 and 100 cm. It prefers grassy places and dry soils, avoiding heavy soils, and flowers between July and September. The flowered head is flatter than similar species Devils bit scabious and Small Scabious. There are 4 stamens in each flower, and 1 notched long stigma. The fruit is nut like, cylindrical and hairy, 5-6mm in size. It has a tap root. The stem has long stiff hairs angled downwards. There are no stipules. The leaves form a basal rosette, are paired on the stem, the lowest typically 300mm long, spear shaped, whereas the upper are smaller.

Inflorescence of Field Scabious

An illustration of the inflorescence of the field scabious. Knautia arvensis, commonly known as Field…

An illustration of the young inflorescence of the field scabious. Knautia arvensis, commonly known as Field Scabious, is a species in the genus Knautia. It is a perennial plant that grows between 25 and 100 cm. It prefers grassy places and dry soils, avoiding heavy soils, and flowers between July and September. The flowered head is flatter than similar species Devils bit scabious and Small Scabious. There are 4 stamens in each flower, and 1 notched long stigma. The fruit is nut like, cylindrical and hairy, 5-6mm in size. It has a tap root. The stem has long stiff hairs angled downwards. There are no stipules. The leaves form a basal rosette, are paired on the stem, the lowest typically 300mm long, spear shaped, whereas the upper are smaller.

Young Inflorescence of Field Scabious

An illustration of the young inflorescence of the field scabious. Knautia arvensis, commonly known as…

An illustration of a ray-floret of the field scabious. Knautia arvensis, commonly known as Field Scabious, is a species in the genus Knautia. It is a perennial plant that grows between 25 and 100 cm. It prefers grassy places and dry soils, avoiding heavy soils, and flowers between July and September. The flowered head is flatter than similar species Devils bit scabious and Small Scabious. There are 4 stamens in each flower, and 1 notched long stigma. The fruit is nut like, cylindrical and hairy, 5-6mm in size. It has a tap root. The stem has long stiff hairs angled downwards. There are no stipules. The leaves form a basal rosette, are paired on the stem, the lowest typically 300mm long, spear shaped, whereas the upper are smaller.

Ray-floret of Field Scabious

An illustration of a ray-floret of the field scabious. Knautia arvensis, commonly known as Field Scabious,…

An illustration of a ray-floret of the field scabious. Knautia arvensis, commonly known as Field Scabious, is a species in the genus Knautia. It is a perennial plant that grows between 25 and 100 cm. It prefers grassy places and dry soils, avoiding heavy soils, and flowers between July and September. The flowered head is flatter than similar species Devils bit scabious and Small Scabious. There are 4 stamens in each flower, and 1 notched long stigma. The fruit is nut like, cylindrical and hairy, 5-6mm in size. It has a tap root. The stem has long stiff hairs angled downwards. There are no stipules. The leaves form a basal rosette, are paired on the stem, the lowest typically 300mm long, spear shaped, whereas the upper are smaller.

Ray-floret of Field Scabious

An illustration of a ray-floret of the field scabious. Knautia arvensis, commonly known as Field Scabious,…

An illustration of the seed of the field scabious. Knautia arvensis, commonly known as Field Scabious, is a species in the genus Knautia. It is a perennial plant that grows between 25 and 100 cm. It prefers grassy places and dry soils, avoiding heavy soils, and flowers between July and September. The flowered head is flatter than similar species Devils bit scabious and Small Scabious. There are 4 stamens in each flower, and 1 notched long stigma. The fruit is nut like, cylindrical and hairy, 5-6mm in size. It has a tap root. The stem has long stiff hairs angled downwards. There are no stipules. The leaves form a basal rosette, are paired on the stem, the lowest typically 300mm long, spear shaped, whereas the upper are smaller.

Seed of Field Scabious

An illustration of the seed of the field scabious. Knautia arvensis, commonly known as Field Scabious,…

"Epicycloidal wheel, a wheel or ring fixed to a framework, toothed on its inner side, and having in gear with it another toothed wheel, of half the diameter of the first, fitted so as to revolve about the center of the latter. It is used for converting circular into alternate motion, or alternate into circular." -Whitney, 1911

Epicycloidal Wheel

"Epicycloidal wheel, a wheel or ring fixed to a framework, toothed on its inner side, and having in…

Illustration of a right spherical triangle and the five circular parts placed in the sectors of a circle in the order in which they occur in the triangle. "The ten formulas used in the solution of spherical right triangles can be expressed by means of two rules, known as Napier's rules of circular parts."

Napier's Right Spherical Triangle

Illustration of a right spherical triangle and the five circular parts placed in the sectors of a circle…

Illustration used to show how to draw an ellipse by circular arcs.

Construction Of Ellipse

Illustration used to show how to draw an ellipse by circular arcs.

A circular leaf border.

Circular Leaf Border

A circular leaf border.

"Human Eye, in Median Vertical Anteroposterior Section. (Ciliary processes shown, through not all lying in this section.) A, anterior, and A', posterior chambers of aqueous humor; a, central artery of retina; C, cornea; Ch, choroid; cj, conjunctiva; cm, ciliary muscle; cp, ciliary processs; H, hyaloid; I, iris; L, crystalline lens in its capsule (the reference-line passes through the pupil); l, l', insertion of tendon of superior and inferior rectus muscles; o, optic nerve; P, canal of Petit; R, retina; S, sclerotic; s, s', circular sinus or canal of Schlemm; V, vitreous body filling back part of the eye." -Whitney, 1911

Median Vertical Anteroposterior Section of Eye

"Human Eye, in Median Vertical Anteroposterior Section. (Ciliary processes shown, through not all lying…

An illustration depicting the inside of an apse. In architecture, the apse (Latin absis "arch, vault"; sometimes written apsis; plural apses) is a semicircular recess covered with a hemispherical vault. In Romanesque, Byzantine and Gothic Christian abbey, cathedral and church architecture, the term is applied to the semi-circular or polygonal section of the sanctuary at the liturgical east end beyond the altar. Geometrically speaking, an apse is either a half-cone or half-dome.

Apse of a Cathedral

An illustration depicting the inside of an apse. In architecture, the apse (Latin absis "arch, vault";…

A circle shape of a shield or escutcheon in heraldry.

Circular Shield

A circle shape of a shield or escutcheon in heraldry.

A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Black and White

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Color

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Outline

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

A sign may be used in advance of an intersection to indicate the presence of an intersection and the possibility of turning or entering traffic. The Circular Intersection symbol sign accompanied by an educational TRAFFIC CIRCLE plaque may be installed in advance of a circular intersection.

Circular Intersection, Silhouette

A sign may be used in advance of an intersection to indicate the presence of an intersection and the…

"TURRETED. A wall or castle having small turrets. In the annexed example the square tower has circular turrets at the angles, and is therefore said to be turreted." -Hall, 1862

Turreted

"TURRETED. A wall or castle having small turrets. In the annexed example the square tower has circular…

The baptismal font is used to baptize children an adults. It is a type of church furniture in a circular shape with a pedestal base.

Baptismal Font

The baptismal font is used to baptize children an adults. It is a type of church furniture in a circular…

This teacup is ornamented with a overlapping elliptical design.

Teacup

This teacup is ornamented with a overlapping elliptical design.

This round brooch is a circular design with a pin going through the center.

Round Brooch

This round brooch is a circular design with a pin going through the center.

This jug and dish were made in Malta. The dish has a leaf and floral design around its perimeter. The jug has a circular leaf design in the center and a mermaid figure as the handle.

Jug and Dish

This jug and dish were made in Malta. The dish has a leaf and floral design around its perimeter. The…

This pocket watch has a unique design on its back of leaves and circles. The circular handle at the top of the watch allows it to be attached to a waistcoat, lapel or belt loop using a chain.

Pocket Watch

This pocket watch has a unique design on its back of leaves and circles. The circular handle at the…

This pocket watch has a unique design of a figure head in the center and scrolls of leaves all around. The circular handle at the top of the watch allows it to be attached to a waistcoat, lapel or belt loop using a chain.

Pocket Watch

This pocket watch has a unique design of a figure head in the center and scrolls of leaves all around.…

This pocket watch has a simple floral design. The circular handle at the top of the watch allows it to be attached to a waistcoat, lapel or belt loop using a chain.

Pocket Watch

This pocket watch has a simple floral design. The circular handle at the top of the watch allows it…

This pocket watch has a simple floral design. The circular handle at the top of the watch allows it to be attached to a waistcoat, lapel or belt loop using a chain.

Pocket Watch

This pocket watch has a simple floral design. The circular handle at the top of the watch allows it…

This pocket watch has a circular handle at the top of the watch allowing it to be attached to a waistcoat, lapel or belt loop using a chain. The screw in the handle is used to wind the watch .

Pocket Watch

This pocket watch has a circular handle at the top of the watch allowing it to be attached to a waistcoat,…

This rug is designed with a circular leaf design in the center, and flowers in each corner.

Rug

This rug is designed with a circular leaf design in the center, and flowers in each corner.

This key is designed in an Italian style. It has a circular top with a leaf scroll all around and an initial in the center.

Key

This key is designed in an Italian style. It has a circular top with a leaf scroll all around and an…