Visionjuice - OPTICAL ILLUSIONS

Here are a few (a very few) optical illusions. They are not puzzles but can be puzzling.
	In this first illusion all of the gaps between the circles are the same size as the circles. The illusion is created because the brain sees white spaces as larger than black. Move your mouse over the image to see it demonstrated.
	This illusion uses the same principle as the first. Most people see the white square as larger than the black. It isn't. Move your mouse over the image to see it demonstrated.
	This one is a bit of an oddity. Where ever you are not looking there are little grey blobs between the black squares. When you look at them they disappear. They are created in your brain because it doesn't expect such a stark contrast as between the black and the white. When you look directly at them you are focusing more on the white and so don't see that area of contrast so starkly.
	And now a few illusions created by Maurits Cornelius Escher. This first one is an impossible three dimensional triangular shape.
	Aand some impossible never ending stairs.
	And some impossible cubes. The cubes themselves are not impossible just their relationship to one another in three dimensional space.
	Many optical illusions make use of the brain's propensity to see sloping lines as perspective. In this picture the two trees are identical and yet the one to the left looks much larger because it looks as though it's further away. Move your mouse over the image to see it demonstrated.
	The small circle is actually a perfect circle however distorted it may appear. Yet again it is the brain trying to force perspective because of sloping lines. Move your mouse over the image to see it demonstrated.
	Yes the horizontal lines are straight and parallel. The sloping lines distort them for the same reason as the last couple of illusions. Move your mouse over the image to see it demonstrated.
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