Stereographic Projection of a HyperSphere (4D Sphere)

Stereographic Projection!

Visualizing quaternions (4d numbers) with stereographic projection

The hypersphere

Turning Spheres Into Squares—Stereographic Projection

Perfect Shapes in Higher Dimensions - Numberphile

The Puzzling Fourth Dimension (and exotic shapes) - Numberphile

Как выглядит 4-х мерная сфера в реальности? Эксперимент со сферической версией тессеракта.

It really seems like our universe could be part of a hypersphere, but... it's probably not

How to see a sphere in 4D

What is the 4th Dimension REALLY? - 4D Golf Devlog #2