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Think-a-Dot
Mathematical toy
Mathematical toy
The Think-a-Dot was a mathematical toy invented by Joseph Weisbecker{{cite web|url=https://davidsarnoff.tcnj.edu/2017/12/10/object-of-the-week-think-a-dot/|title=Object of the Week: Think-a-Dot
As the ball passed through the Think-a-Dot, it would flip the disk mechanisms that it passed, and they in turn would determine whether the ball would be deflected to the left or to the right. Various puzzles and games were possible with the Think-a-Dot, such as flipping the colours of all cells in the minimum number of moves, or reaching a given state from a monochrome state or vice versa.
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