From the time we wake up to the time we go to bed, we encounter too many objects to count. We’re surrounded by three-dimensional figures and they seem to have an endless variety of shapes. Among these, the most balanced are these five three-dimensional figures: the regular polyhedrons.

Originally released by PBS, 2012. Streaming video file encoded with permission for digital streaming by Infobase on February 13, 2017.

Mathematica—Five Brothers of the Three-Dimensional World: The Regular Polyhedrons (10:06); .