Since production of the LEGO block in 1949, the design hasn't changed and is available in 53 colours. The blocks are made of a plastic granulate, which is melted and pressed in a moulding machine ...
Case and point: this NXT project which can sort LEGO pieces. Just dump a bucket of random blocks in a hopper on one end of the machine. One slice at a time, these plastic pieces will be lifted ...
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