How I Built an AI to Sort 2 Tons of Lego Pieces

For many years as a child, I did nothing but play with Lego. Eventually I had children of my own, who had a nice Lego collection themselves, but nothing you'd need machinery to sort. That changed after a trip to Legoland in Denmark. I noticed adults at the park buying Lego in vast quantities, despite its high price. Even second-hand Lego isn't cheap, sold as it is by the part on specialized websites, or by the boxed set and in bulk on eBay.