Created When Version 2 Appeared

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Region enclosed by two Cylinders

Hyperbolic Paraboloid above a Disc

Circles Tangent to Two Fixed Circles on a Sphere

Graph of cos 2t Wrapped around a Cylinder

A Surface with Horizontal Cross Sections Formed by Ellipse

Hyperbolic Paraboloid above a Disk

Hyperbolic Paraboloid above a Square

Colorful Ice Cream

Möbius Band

Region Enclosed by Two Parabolic Cylinders

Ribbon

A Ruled Surface

Spiral

Torus

Torus Formed with Horizontal Circles

Unknown

Villarceau Circles