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A working, tangible example of an OR logic gate using LEGO bricks.
What happens when you want to try 0 0 ... looking at the gears it wouldn't allow that... would it?
Looks like 0 0 (both out) would cause the output to be a zero (pulled all the way in). It does look like 1 1 will push the output out further than a 1 0, but any amount of outward push is a 1, I guess, so the logic is right.
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