Great idea! reminds me of another project that used IR leds behind a blank canvas in an art gallery. When people go to take a picture of "what junk passes for art these days" the secret "painting" is revealed. This is really cool either way, I was just thinking merging the two would be interresting.
This thing is way above my pay grade, so if the questions are foolish, I apologize.
How many charactors can this device store? Must they always be displayed in the same order or can you automatically change messages? Do the LED's damage the parent painting? Could you set other displays and shuffle between using the same controller.
Some earlier post mentioned waiting rooms and I am just trying to figure how many times I would be willing to read it before I scream and want to tear it down.
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