This is an excellent scientific novelty which causes amazement when people see it for the first time, irrespective of whether they are scientifically minded. (The version in the Davenport Collection was made for an American company, hence disk rather than disc.) The base is a slightly concave mirror on which you spin a heavy disk, much like you would spin a coin on its edge. However, unlike a coin, the heavy disk spins for a very long time and, as it slows, the sound it makes changes. There is a real surprise when it stops. There are a number of magnetic pieces with holographic surfaces which can be placed on the flat surface of the disk and which create intriguing light and colour patterns as the disk rotates. According to the box it was invented by Joseph Bendik in the 1980s. Made in Taiwan.

After winding the yellow key on the left, when a coin is placed in the bowl on the right and the button is pressed, the snake charmer bends forward and the snake rises out of the basket. At the same time the coin drops into the bank. Two batteries in the base should also activate some music, but unfortunately this is not working on this example. Made in plastic by Everlast Toys, Hong Kong. Copyright 1998 Everlast.

This is an amazing illusion in which, as you walk around a room looking at the dragon, it turns its head so that it appears to be following you. The design was downloaded from the web and constructed by John Davenport circa 2008. The design was originally produced for Gathering for Gardner 3 in Atlanta, Georgia, USA 16-18 January 1998. Copyright 1998 Binary Arts Corporation. It was inspired by the work of Jerry Andrus.

This book is full of pre-punched cardboard pages, printed in colour, from which the box shapes can be pressed out and folded. Published in 1998 by Benedikt Taschen Verlag GmbH.