What type of optical illusion is this?

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e1ectricthunder

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What type of optical illusion is the ones where theres two pictures in one,but you only see 1 at a time?What are these called?Is it a certain type of illusions?Is there even a name for it?

Here's an example of one where its both a vase AND 2 faces.
http://en.wikipedia.org/wiki/Image:Cup_or_faces_paradox.svg
 
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