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.
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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