Talking about illusions in class today - this is one of my favourite ones, and I think it works better on the screen than on paper:
Yes - believe it or not, squares 'A' and 'B' are exactly the same shade of grey.
Illusions like this help us to understand a key idea of the 'cognitive perspective' - the world that we percieve is to a large extent constructed by our mental processes. How we respond to objects and events can depend on our expectations and thought processes.
In this example, we expect square 'A' to be black and square 'B' to be white - so that is what we see!
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