Here is a brief intro on optical illusions from wikipedia although we don’t know if this is one!
An optical illusion (also called a visual illusion) is one which shows images that differ from normal reality.
The information gathered by the eye is processed in the brain to give a perception. That is normal, but in these cases the appearance does not tally with a physical measurement of the stimulus source.
There are three main types of visual illusion:
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literal optical illusions that create images which are different from the objects that make them
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physiological illusions: they are the effects on the eyes and brain of over-stimulation of brightness, colour, size, position, tilt, movement
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cognitive illusions, the result of unconscious inferences (brain makes the wrong decision).
What do you think? Feel free to comment with your ideas on what caused this strange phenomenon.
