A lot of people call that a "pixel forest". "That guy" is Tom BetGeorge, probably the best sequencer and lights guy you can find, anywhere. Gosh knows that he gets to play with some very advanced props/lights/drones/etc.
I suggest you search for "pixel forest" to see the different ways people have implemented these. You may also want to search for "Peace Stakes" after David Peace. I'm not saying he was the inventor of them, but they do carry his name. He did a video a while back as to how he did his home using these.
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