Grid stereographic projection - photo

[Altair]

Grid stereographic projection by mathematician Henry Segerman.

"A light placed at the top of a 3D printed sphere casts a surprising square grid shadow. This illustrates 'stereographic projection'�, which is the map from the sphere to the plane you get by drawing lines from the north pole of the sphere and sending the point the line hits on the sphere to the point the line hits on the plane."




More:

https://artthescience.com/blog/2016/...enry-segerman/


Previously:

Drawing three right angles on a sphere - GIF
3D-printed right-only pointing arrow illusion - GIF
basic woodworking "impossible" optical illusions
Michael Jackson's anti-gravity illusion shoes - GIF and patent