This is very cool:
Challenge: Steve determined that he needs to look at five ‘pip’ (black dot) locations to uniquely identify each number. Can you explain why? Are there any other arrangements of five sensors that could work? Remember that each number could physically be rotated to four different positions, and you need to detect it no matter how it is stuck in. Answer on Monday.
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im not impressed
ha! maybe we should build one in class then?