Consisted of a set of round disks usally 6 to a set. On the outer edge were numbers under a small mark. Around the inner area of the disk were various uneven lines and other shapes each of which were numbered. If there were 12 numbers on the outer edge then there were 12 lines and shapes in the inner area. You pinned a peice of paper on a surface which you could put a pin in such as a peice of cardboard and then placed the disk on top in the centre of which was a pin hole so you could pin it to the paper so it did not slip. You then placed a mark on the paper at the outer edge of the disk and lined up the no:1 on the outer edge to the mark next filling in the corresponding line or shape with a pen. Next of course you needed to turn the disc to line up no:2 to the mark on the paper which you had made and then filled in the no:2 corresponding line or shape. You preceeded like this until all numbers on the disk outer edge and their corresponding line or shape was completed. Once done, you would (if correctly done) have a character on the paper which you could then colour. In this way by carful placing of the disk on the paper you could build up a scene.