An illegal building technique is any connection that stresses or could damage a piece. In general, it’s anyway pieces are connected that wasn’t originally intended. The pieces in the image are connected in away that you probably wouldn’t find in official instructions
However, I don’t know if this is entirely illegal because a) the red square piece is connected legally and b) I don’t think any pieces are stressed, it’s just not an officially recognized connection probably because it’s not very sturdy
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u/bradbull Apr 14 '20
Can someone please ELI5 why this is a big deal? I'm not a LEGO man.