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.
If you would like to see more great ambigrams check out our John Langdon Gallery.
Here we have three pictures of a bunch of pencils laying on a desk. At first glance they all look the same, but on second viewing you will notice that the lead in the large pencil on the left is different in each picture. So what's the illusion? Well, in one of these pictures the lead in the large pencil is the same size as the lead in all the smaller pencils. Can you tell in which one they are all the same?
Animated by Optical Spy from an unknown source image
Here we ask the question which parts of the bridge are the longest, A & C or B & D? This is our take on a famous old illusion called the Jastrow Illusion.
If you keep you eye on one of the balls the other one seems to be all over the place. Then try it with the other ball.
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