Wall Drawing 797 is a conceptual artwork by Sol LeWitt consisting of instructions that anyone can use to make a drawing. I found this at The Kid Should See This1 and I cannot improve on their description:
How does one person's actions influence the next person's actions in a shared space? Sol LeWitt's wall drawings explore this intricate visual butterfly effect in the collaborative art entitled Wall Drawing 797, a conceptual piece that can be drawn by following LeWitt's instructions. (He died in 2007.)
"Intricate visual butterfly effect" is such a good way of putting it. I have a huge wall right above my desk...I kind of want to make my own Wall Drawing 797 now.
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You should be reading The Kid Should See This even if you don't have children. It's always so good and interesting.↩