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 Hint | Spoiler by Sir Percivale)

You're welcome Percy. I was stuck on this having not considered the 'twist'. Actually I might have considered it for a moment, but dismissed it thinking it would be symmetric anyway so it wouldn't matter. ...goes to show.

Good puzzle Tristan.

Posted by Eric on 2005-12-07 03:26:40