New York Pops Up
An excellent info-graphic that uses a "3-D" effect to portray population. In this case, it contrasts the population shift that goes on in New York City (a portion of Manhattan, to be specific) between day and night. The bars showing relative numbers looks like a stratospheric city skyline:
I got a chuckle when my imagination created the image of a city with massive towers that rise out of the ground as workers arrive in the morning, and recess in the evening as all the workers go home. No need for elevators!
Via The Urbanophile