Simple geometry never gets old. The #11 has three brass discs with a 40 mm prism crystal. The discs are textured and have a convex/concave play that allows them to play with the light in every direction.

Measurements
It measures a total of 16" long and about 1.6" wide (the width of the crystal). The brass+crystal section is a little over 6" long. All metals are brass.

Made by hand by Sol in Ridgewood, NY.