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"The illustration represents a cubiculum, or small chamber, as most of them look when discovered. The graves have been opened and the bodies taken away."—Webster, 1913

Interior of the Catacombs

"The illustration represents a cubiculum, or small chamber, as most of them look when discovered. The…

Illustration showing a circle with equilateral triangles and another circle within.

Circle With Triangles and Circle Within

Illustration showing a circle with equilateral triangles and another circle within.

The Great Pyramid of Giza, also called Khufu's Pyramid or the Pyramid of Khufu, and Pyramid of Cheops, is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now Cairo, Egypt, and is the only remaining member of the Seven Wonders of the Ancient World. The Great Pyramid is the only pyramid known to contain both ascending and descending passages. There are three known chambers inside the Great Pyramid. These are arranged centrally, on the vertical axis of the pyramid.

Great Pyramid of Giza, Cross Section

The Great Pyramid of Giza, also called Khufu's Pyramid or the Pyramid of Khufu, and Pyramid of Cheops,…

The Grand Gallery features a corbel haloed design and several cut "sockets" spaced at regular intervals along the length of each side of its raised base with a "trench" running along its center length at floor level. What purpose these sockets served is unknown. An antechamber leads from the Grand Gallery to the King's Chamber.

Great Pyramid of Giza, Section of the Grand Gallery

The Grand Gallery features a corbel haloed design and several cut "sockets" spaced at regular…

The King's Chamber is lined with red granite brought from Aswan 935 km (580 miles) to the south, of which the blocks used for the roof are estimated to weigh 50 to 80 tons. Egyptologists believe they were transported on barges down the Nile river.

Great Pyramid of Giza, King's Chamber

The King's Chamber is lined with red granite brought from Aswan 935 km (580 miles) to the south, of…

A: King's Chamber; B: Queen's Chamber; C: Chamber Cut in Rock.

Section of Great Pyramid

A: King's Chamber; B: Queen's Chamber; C: Chamber Cut in Rock.

"Suppose the tumbler, a, to be filled with water, and placed beyond the principal focus of the concave mirror, and so managed as to be hid from eye c, by the screen b. The lamp by which the tumbler is illuminated must also be placed behind the screen, and near the tumbler, To a person placed at c, the tumbler with its contents will appear incerted at e, and suspended in the air." -Comstock 1850

Deception by Mirrors

"Suppose the tumbler, a, to be filled with water, and placed beyond the principal focus of the concave…

The interior has a richer appearance, chiefly owing to the use of columns of a round cylindrical shape. These are, moreover, of the most varied form, and without exception represent objects drawn from the vegetable world.

Interior of the Temple of Philæ

The interior has a richer appearance, chiefly owing to the use of columns of a round cylindrical shape.…

Illustration showing a triangle with an altitude CD passing through the middle of EF. Triangles AEC and BFC are isosceles.

Triangle With Altitude and Isosceles Triangles Within

Illustration showing a triangle with an altitude CD passing through the middle of EF. Triangles AEC…