All these illusions were generated online using Make a tessellation online.
| Phantom dots appear between the squares. | Stare hard at this for a minute. Then close your eyes, and you will see red squares on a green background. | |
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| The blue lines are parallel. (Oh yes, they are!) | The vertical lines are straight. (Honest!) | |
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| It won't stay stil! | Are these res quares on a yellow background, or yellow squares on a red background? | |
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| Can you see the yellow squares? (But they aren't there!) | I'm not quite sure what this does, but it looks pretty! | |
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© Jo Edkins 2004