The mathematics of stereographic projection retrieves this banded torus from the unit sphere in four-space. The bands' edges are unit circles, any two linked. More about the math behind this piece is explained in a shop blog post.
This flower-like red nylon pendant is lightly textured, about 1-3/8 inches (35mm) across, and comes with a 2mm dark brown cotton cord with a handmade silver-colored wire hook clasp. Please specify the desired cord length in the order form comments. (If unstated, the cord will be 17 inches, yielding an approximately 18-inch necklace including the clasp.)
