Optical Illusions; Are They of Scientific Value or Just Ephemeral Entertainment?
By John McElborough

We've all had some fun with optical illusions, staring blankly at pictures for 5 minutes until a rabbit turns into a duck, or a Jackson Pollack style painting slowly morphs into a forest scene, or more often than not nothing happens at all and you've been gazing dumbly at a set of squiggly lines and splodges for God knows how long.

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