The disk should be placed on a flat surface and spun. When you stare at the centre for 15 seconds and then look away, whatever you look at begins to swirl in a most disconcerting way. The disk was invented by magician and optical illusion expert Jerry Andrus and produced by Binary Arts Corporation, Alexandria, VA 22314, USA. Copyright 1998 Binary Arts Corp.

By turning the metal handle the device makes a loud clacking noise. Experience teaches that it pays to keep your fingers well out of the way of the mechanism when you turn the handle.

The garden photograph illustrated here is obviously the one from which the locket photograph was cut. The photograph was taken in the back garden at Ivydene, the Davenport family home, as can be proved by the garden gnomes in the background. We do not know who the child is, but a good guess would be June Davenport. June is Gus and Kate Davenport’s eldest child born in 1942. Czechoslovakia is stamped into the back of the locket.

The way to make a realistic bird song is to hold the trunk of the tree and push it upwards towards the top. When you then twist the trunk, the resultant squeaking noise is very like bird song. The bird revolves as it sings. Attached to the tree is a sample tag with 640/3 on it. The probable place of manufacture is Germany.

This is a traditional noise maker. Hold the beads at the end of the double strings, one in each hand, and spin the noise maker around to wind up the strings. When you then pull outwards on the strings the spinner in the middle starts rotating. As you repeat the process the spinner revolves faster and faster and starts to make a loud whirling noise. Made in Germany.

In whichever order these 24 cards are laid side by side, the result will be a perfectly harmonious landscape. The packaging tells us that the Myriorama was a popular novelty during the 19th century. This version is apparently closely based on one published in Leipzig in the 1830s. Supplied by Tobar, St Margaret, Harleston, Norfolk.

When the two base boards are pulled apart against the pressure of the spring, and then released, as they come together air is forced out through the horn. As a result of the spiral metal (on the left hand side of the photograph) altering the speed of the base boards coming together, the horn produces a very impressive squawk.