You must have been elsewhere, then, when Cal tried to remake this board into a board about running a board, then.
he likes rules.
... and why is that?
It is "PARTLY" because, without rules we can not know how close we can go to the edge without falling off, because we don't know where the edge is.
Besides all that, we are just barely beginning to fly. The edge can hurt us, if we step wrong.
being a bird only gives you wings, but not the ability to fly. That has to be learned.