Locking up bikes to poles in an urban environment is always a tricky proposition. Often you will see bikes with two locks, one for each wheel and of course the frame. But with this ingenious invention by 21 year old Kevin Scott, the bicycle will fold over itself around the pole:
A ratchet in the seatpost part of the frame is used to tighten or bend the bike’s frame. Once it’s in the curved position, you can use a single lock to secure both wheels and the frame. I’m not sure how rigid a cable pulled frame will be over the long haul (you definitely don’t want it going all limp while you’re riding! that’s what she said) but it’s an interesting idea that should be explored further.