The disc of laser light is invisible - until a visitor places a solid object in its path.  Then beautiful and surprising cross sections instantly appear: hexagons in a cube, parabolas in a cone, or contour maps on the surface of a hand.

The ring of eye-safe lasers is large enough to allow multiple visitors to interact with the exhibit at once, providing an opportunity for collaborative learning.  Every three-dimensional shape hides a multitude of unexpected cross sections, and the Ring of Fire allows visitors to explore them effortlessly, making the previously hidden geometric relationships suddenly visible.

The National Museum of Mathematics is the owner of U.S. Patent Nos. 8,602,790; 9,165,479; and 9,472,120 covering one or more exhibits at the Museum.