Rabscuttle wrote:
Perhaps more interestingly, if you sort coordinates by how many rooms there are, there appears to be a definite skew towards the NE. If you sort by number of rooms, 1N1E is higher than 1S and just higher than 1W.
Actually, that looks like something I once read in a psychology book. For some reason, when people are forced to make a choice between going left or right at a junction, they are far more likely to go right than left, which is perhaps where the preference for east over west comes from (perhaps because we read from left to right?). As for north and south, maybe because of the orientation of the room on the screen, moving in the north direction might look like you are moving forward (upward), compared to moving south, which looks like you are moving backward (downward) towards yourself, and the mind prefers moving forwards than backwards.
However, to be a little more serious, I found this happening while making Bavato's Dungeon; almost all of my levels went eastward (but not generally northward). Because of this, and some story constraints, I then changed all the level layouts on purpose to make the exit stairs east of the entrance stairs on every level, so making the entire dungeon "
travel"
eastwards as it descends. I believe this may have therefore skewed your count by some amount, since I think there are very few rooms west of the entrance stairs in any of the levels.
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Resident Medic/Mycologist
Also, Atch has gotten the Long Ascent: 2N2E down to 66757.
)
Those multitude of mimic rooms don't make for obvious optimisation, and I've no doubt that the most of the rooms can still be bettered. I guess it's good that mimic placement moves no longer count or else it would be even more complex 
O