This specimen came from Boron, California. It is called TV Rock because, if you place it over an image, the image appears to be at the top of the rock, as on a TV screen. The fibers of Ulexite act as optical fibers, transmitting light along their lengths by internal reflection. Much more detailed information can be found on the web.

It is called TV Selenite because, if you place it over an image, the image appears to be at the top of the rock, as on a TV screen. The fibres of the selenite act as optical fibres, transmitting light along their lengths by internal reflection. Lots of detailed information can be found on the web.

Produced by Pollock’s Toyshop, in support of the Wilton’s restoration fund, the diorama card is an illustrated peepshow of Wilton’s in the 1850s. With an illustrated backplate on which to write a message, the card folds down flat and comes with an envelope. Bought from Pollock’s toyshop in Covent Garden in 2016.

Made by Eye Think, Inc, USA. This is the brainchild of Rufus Butler Seder, president of Eye Think. When you hang the disc from a thread and spin it, you can see the cat running.

A lithophane is a moulded 3D image in very thin translucent porcelain that can be seen clearly only when back lit with a bright light. The design in the base of this cup looks like a Japanese Geisha Girl. Apparently the characters on the base can be translated as ‘Special Make Japan’.