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
 We thought it might be fun to expand Escher's relativity.
 If you stare intently at the center pink spot the blue dots will start disappearing.
 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.
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.
Original image source: unknown - Animation by Optical Spy
 In this lovely Scottish rock specimen of Marine Agate (probably born in bubbles in basalts that were erupted some 400 million years ago during the closure of the Iapetus Ocean) it looks like we are looking through a window into a mysterious beach world on a misty dawn, looking over a calm bay towards distant hills on the other side. In fact it is just the beautiful colors inside the rock.
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