Henry Segerman

Associate Professor of Mathematics

Oklahoma State University

Stillwater, Oklahoma, USA


Henry Segerman is an assistant professor in the Department of Mathematics at Oklahoma State University. His mathematical research is in 3-dimensional geometry and topology, and concepts from those areas often appear in his work. Other artistic interests involve procedural generation, self reference, ambigrams and puzzles.


Image for entry 'Stereographic projection (grid)'

Stereographic projection (grid)

10 x 9 x 9 cm

3D printed nylon plastic, lamp


The light rays from the lamp are partly blocked by the shrinking design on the sphere; the resulting shadow is a regular tiling of the plane by squares. This illustrates how stereographic projection transforms the sphere, minus the north pole, into the plane. Note how shapes are slightly distorted near the south pole, and dramatically distorted near the north pole.