I intended to make some sort of an M.C.Escher tribute here. I'm sorry this isn't very complete and far from being perfectly well done, but it somewhat started to make me feel dizzy...;) And even though I'm not very convinced by this, I don't think I'd come up with a way better execution soon.
I hope for Mr Escher that there are better tribute fonts for him out there! He'd definitely deserve it...
It was by the way funk_king's Impossible Alphabet
that reminded me of this unfinished thing laying around in my messy unpublished fontstructions box, and made me take it out and finish it. (If you can call 42 characters "finished".)
Also check out Frodo7's Hommage à Escher
, geneus1's IsoMatrix 3D
, and funk_king's Soma
for some other great Escher-esque fontcrafting!