23 x 10 x 9 cm
9" x 4" x 3.5"

Optical glass prisms in velvet lined mahogany box, white base.

One of a series of 9 Crystal Clusters, works using periscope prisms made for 2nd WW Centurion tanks.

Each of these prisms has the same geometric shape. I was interested to find out how many possible different combinations I could make with that shape.