Like a wheel within a wheel.
See colors that aren't really there.
A face seen upside down may hold some surprises.
You can see the spring, but you can't touch it.
A clueless way to determine the size of an object.
This visual illusion makes the palm of your hand appear to squirm and twist.
Motion helps you see things you might miss otherwise.
It's all done with mirrors.
What you see is often affected by what you expect to see.
Without a boundary, it's hard to distinguish different shades of gray.
Now you see it; now you don't. An object without a sharp edge can fade from your view.
A lens creates an image that hangs in midair.
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© 2014 Exploratorium
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