I see a lot of questions and answers asking if certain builds or connections are "legal".

As a complete novice with little understanding of LEGO terminology what does that phrase mean? If certain things are legal does that also mean that mean that other things are prohibited? What/who defines LEGO legality?

The question referenced in the comments doesn't answer my question because it doesn't define what "legality" actually is. The referenced question provides a few examples of "illegal" connections but because of my knowledge (or lack of it) I'm still unable to determine what actually is "legal".



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