TAHTA 4D NO FURTHER A MYSTERY

In a few Proportions, a circle could possibly be extruded to form a cylinder. In 4 Proportions, there are plenty of distinctive cylinder-like objects. A sphere might be extruded to get a spherical cylinder (a cylinder with spherical "caps", often called a spherinder), along with a cylinder can be extruded to get a cylindrical prism (a cubinder). I