Seeing in four dimensions

Mathematicians create videos that help in visualizing four-dimensional objects

Three dimensions can be so limiting.

FLATLANDERS Visualizing three dimensions would be as hard for these flat lizards as visualizing four is for us. Leys, Ghys and Alvarez
THE FLAT VIEW A flat lizard could try to get a sense of a tetrahedron by watching the shapes it creates as it passes through the lizard’s two-dimensional world.