I have always wondered, why stud notches (aka missing notches of plastic) are always deeper than studs are tall?
To see what I mean, take any piece that has stud notches, a common example is the 2x2 round brick, and click it onto another brick, and you will see, there are gaps at the tops of the notches.
Was it because LEGO once made bricks with taller studs, and are always making the notches as deep as they are to maintain backwards compatibility?
Gary "LEGO Historian" Istok, where are you?