Core77

Recession or no, I still see plenty of cranes in Manhattan putting up new buildings. Thing is, I've still never seen them actually put the cranes up; one day they're just there, and some days they mysteriously get taller.

If you've ever wondered how they assemble cranes on-site, and then how they manage to raise them higher, check out this animation from Italian company San Marco Cranes:

Too conventional for you? Then check out this self-erecting crane:

via wired