Six Pillows' Secret Pendant

This smooth pendant hides a secret in its center. There the six pillows almost meet, in contrast to our "four pillows" pendant where the pillows do meet in the center. You may simply like it (or not), but you might be astonished by learning that this is actually a piece of math: As most of our objects, this pendant is defined by a single mathematical equation. It fascinates by its symmetry which is the same symmetry as an octahedron.