Click the image and stare at the cross for 30 seconds - you might be able to make one of the letter 'a's grow. Click the image to see.
Attribution: Used with permission - Copyright © G Sarcone - www.archimedes-lab.org
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Are squares A and B the same colour?
Is this a duck or a rabbit?
Can you tell what this is a picture of?
Which way is the dancer spinning?
Can you find his three daughters as well?
Who is missing?
Is the water flowing uphill in this impossible waterfall?
A demonstration of your visual blind spot.
Are the eyes the same colour?
Is this a colourful butterfly?
Are the horizontal lines parallel?
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