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