I thought this was pretty good color illusion.  I don't have a LED matrix

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I thought this was pretty good color illusion. I don’t have a LED matrix but thought someone might have fun trying to re-create it.
http://www.youtube.com/watch?v=n_5g9URYGo4

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Interesting.

I wonder what density you’d need in order to show the effect in full.

Probably would be cool on a high density wall display

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I wonder if this is as easy as surrounding one strip on two sides…