There is a strange circular disk on a table. It has twelve congruent sectors, each of which is either opaque or transparent.

An identical disk is placed on top of it, and spun around. The table underneath the disks is brightly colored, so that every 30 degrees of rotation, you can count the number of regions out of 12 that are transparent. Those numbers are 2, 3, 4, 4, 0, and 4 for the first half of a revolution. Without any more information, can you figure out exactly what a single disk looks like?

(In reply to re: Solution by Charlie)

Charlie is correct, the discs can produce his pattern. However to understand the solution you have to spot the hidden twist it contains.

Posted by Percy on 2005-12-04 13:01:34