This is something we found at the Escher Museum in the Hague, Netherlands. I love the experience of Multi-touch on a very large screen. The final image is shown below, taken from here.

Of course, I strongly recommend checking out the mind-bending work of this guy.
Mr. Jobs himself marketed multi-touch as awesome.
I plan to write more soon about what makes these interfaces powerful. Hint: It’s an idea called Direct Manipulation.
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