Henry Segerman

Associate Professor of Mathematics
Oklahoma State University
Stillwater, Oklahoma, USA
Henry Segerman is an associate professor in the department of mathematics at Oklahoma State University. His research interests are in three-dimensional geometry and topology, and in mathematical art and visualization. In visualization he works in 3D printing, spherical video, virtual, and augmented reality. He is the author of the book "Visualizing Mathematics with 3D Printing".
Where do these circles come from?
A sphere made out of cubes has many visible circles on it. Why are they there, and what determines where on the sphere they appear? Thanks to Ravi Vakil (and his son Benjamin) for noticing the circles and asking the question, and to CodeParade (http://codeparade.net) for the photos of the Legoland globe.