A detail from William Kentridge's "Rebus" sculpture series. When viewed from another angle, the nude reveals the image of both a stamp and telephone.
Is this an apple tree or an orange tree. The only way to find out is to stare at the red dot for thirty seconds and then look at a white wall or ceiling and maybe keep blinking.
This fish illusion has been floating around (see what I did there) for a few years but until now never made it into the Optical Spy database. Source unknown
Stare intently at the white dot between the Green & Red tiles for 30 seconds and then look at the white dot between the dunes. Source TEDTalks
A pavement installed in a Welsh town which creates an optical illusion that hides a kerb has caused at least 20 people to trip so badly that they needed to be taken to hospital.
Source: Daily Telegraph
Stare at the black dot in the third car on the right for 30 seconds or more then your eyes will create a black car that you might be able to "park" between the other two, if you have good eye coordination.
A variety of spectacular Scottish agates from Alan Mason.
The titles of the illustrations are my own, but the details are from “Agates” by A C Bishop and W D I Rolfe, published by National Museum of Scotland and British Museum (Natural History), 1989.
At the time of publishing, Bishop was Deputy Director and Keeper of Mineralogy at B M (N H), and Rolfe was Keeper of Geology N M S.
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