DETAILED NOTES ON TAHTA 4D

In 3 Proportions, a circle might be extruded to form a cylinder. In four Proportions, there are lots of different cylinder-like objects. A sphere can be extruded to obtain a spherical cylinder (a cylinder with spherical "caps", often called a spherinder), and also a cylinder could be extruded to obtain a cylindrical prism (a cubinder). When on the