The specimen is birefringent. Place the specimen on some writing and note how the two images move as you rotate the specimen while you are looking through it.
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 in England. As you tilt the box, the images of the red balls move sideways and up and down in a striking way.
This is a striking example of how eye catching pictures could be created using prismatic foil.
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’.
The book has an optically intriguing cover which produces multiple 3D images of the person looking at it, one image in each of the circular shapes on the cover. The book is full of well presented items, including a pop-up page to illustrate a particular type of optical illusion. Published by Dorling Kindersley, London in 2013.
The ring contains a Stanhope lens. When held very close to the eye, and looking towards a bright light, the image becomes visible. Details of Stanhope lenses can be found on the web.
As the wheel is spun using the knob at the back, the colours on the wheel change.
Holographic hearts appear around the candle, or other lights, when viewed through the special glasses. Made in Taiwan for Worldwide co, npw.co.uk.
This is a novelty optical card. When folded in half and held up to the light an unexpected image is seen. It came into the collection as part of the Grand Illusions (www.grand-illusions.com) Christmas Pack 2018/2019.