Someone built a difference engine – the first computer ever designed by Charles Babbage – out of Legos. The difference engine is more of a calculator than a computer in that you can’t load multiple programs on it, but it was still extremely revolutionary for its time. In fact, it was only designed on paper and wasn’t actually built until the 1990s!
Here’s the link to the Lego Difference Engine…. raw geekage at its best!