Bricks, beams, axles, gears, mini figures, and all other parts in the Lego system are manufactured to an exacting degree of precision. When snapped together, pieces must have just the right amount of strength and flexibility mixed together to stick together.
They must stay together until pulled apart. They cannot be too easy to pull apart, or the resulting constructions would be unstable; they also cannot be too difficult to pull apart, since the disassembly of one creation in order to build another is part of the Lego appeal.
In order for pieces to have just the right "clutch power", Lego elements are manufactured in molds made within a tolerance of 2 µm.
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