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Lego pieces have been made from acrylonitrile butadiene styrene, a strong and resilient plastic, since 1963. For the past three years, Lego engineers have employed CAM/NX CAD/CAE PLM software to model the pieces of Lego. Through this software, engineers can ensure that the Lego pieces are optimized via stress analysis and mould flow. How exactly does this work? Basically, the acrylonitrile butadiene styrene plastic is heated to the staggering temperature of 232 °C until it develops a dough-like form of consistency. The plastic is then injected into the molds at the extreme pressures of between 25 to 150 tonnes! The moulds have a tolerance of up to two micrometres in order to ensure that the bricks remain connected. Humans then inspect the output of the moulds and remove bricks that vary in thickness or colour to the norm.

Now when you play your lego ninjago, you know the process that brought your lego to you. Apparently, 18 of every million bricks are removed by human inspectors after they have come out of the mould! So you can truly say that at the Lego Group, they known each and every brick!