Virtual bricks with snap points.
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Lego flat plates created with a 3D design package called TriSpectives professional. The blue lines on the
top of each bump are snap points. There are corresponding snap points on
the bottom of the bricks. When stacking bricks, the bottom snap point of
one brick is placed on the top snap point of the other brick. The two models
then automatically position themselves correctly, just like snapping real
bricks together.