The Bulbdial Clock kit is based on an original design concept from IronicSans.com and developed at Evil Mad Scientist Laboratories. It works like an indoor sundial, but with three shadows of different length. You tell the time just like you do on a normal clock, by reading the positions of the hour, minute, and second hands.
LINK URL Bulbdial Clock Kits.
These kits fascinate me, and I now have one queued up for the next project to build.
Should be fun!