How in the world do they make ping-pong balls so perfectly round? Making perfectly round spheres is not easy, unless it's soap bubbles, and you can't make them anything but round. No matter what shape ...
In an earlier column, I introduced my 12x12 ping pong ball array. As you may recall, each of the ping pong balls is equipped with a tricolor LED in the form of a WS2812B. These are commonly known as ...
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