not a sundial

It's not exactly a sundial, but I have a crystal dodecahedron suspended in my west window over my office desk. On sunny days, sunny afternoons, for a brief period of time, with the perfect alignment, the sunlight catches the crystal ball, and fills my living room with little spectrums and small white triangles. Two days in a row now I have enjoyed the sparkling light show.

I'm looking forward to spring and summer.

The porro prism I have (which I bought surplus years ago) up in the sill is also catching the Sun.

The Crookes radiometer is slowly turning.

§

Actually, it's not a dodecahedron. It has more faces. Each face is a triangle. Non-uniform shapes to the faces as well as the overall shape. So, until I find the official term, it is a polyhedron...