PhiTOP
Phi Top
U.S. Educator Price
$21

The PhiTOP is an egg-shaped top (a prolate ellipsoid) that can be spun by hand to stand up on end. This is a fascinating demonstration used by Nikoli Tesla in 1893.

What's Included
  • 1x PhiTOP
  • 1x Mirror Stand
What to Consider

See the Buying Guide for this item's required, recommended, and additional accessories.