Because I'm a total geek, I love things like this. Carl over at retrotext decided he wanted to try and build a calculating machine out of Legos. The big block up at the top accepts a little stick with 2-piece bricks that serve as 0s and 1s. When inserted into the large block and push up, a pulley of sorts pulls up a bar along a number line to the corresponding decimal number. You can see an actual demonstration in the above video.
It's really quite simple but entirely awesome.
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