ClipArt ETC
"...the ideally developed form [of a zircon crystal]. The crystal is a combination of five simple forms: two tetragonal prisms, two tetragonal bipyramids, and one ditetragonal bipyramid." -The Encyclopedia Britannica 1910

Crystal of Zircon (ideal)

"...the ideally developed form [of a zircon crystal]. The crystal is a combination of five simple forms:…

Diagram showing the circulation in an ideal ocean extending from pole to pole and covering one fourth the circumference of the earth.

Ideal Ocean Circulation

Diagram showing the circulation in an ideal ocean extending from pole to pole and covering one fourth…