Coordinate planes xy and zw intersect only at the origin. Place a unit hypersphere at the origin, we can see those intersected unit circles by stereographic projection.

Today, let's look at how regular polytopes are specifically constructed. Featured content： 1. Analogous processes for the 16-cell and 24-cell 2. Hypersphere densest packing problem 3. Layered structur

Today, we will explore 4D positional relationships between lines, planes, and cells, more interesting 4D solid geometry problems in tesseract, and generalizations of certain solid geometry theorems.

This article is for readers with a basic understanding of 4D space (e.g., knowing about tesseracts, etc.). Featured content includes prisms, pyramids, hypervolumes, and surcell volumes.

This is not the first article!? But this is indeed my first article. An explanation of the title and the self-referential sentence...