B3

Andy Carroll, an apparently highly-skilled Lego builder and mathematician, created this functional mechanical computer, modeled after Charles Babbage s Difference Engine, which was a precursor to modern-day computers.

Amazingly enough, this machine is able to solve mathematical problems known as second- and third-order polynomials, and is able to calculate those to three or four digits.

There are many more images.
(source: Woz)

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