The finalists of the Urban Prototyping: San Francisco competition are all easily replicable ideas that could spread to cities worldwide, from the whimsical (giant playable keyboard) to the serious (measuring traffic)

URBAN PARASOL

PPPLANTER

INSTANT [PLAY]GROUND

DARKNESS MAP

DIY TRAFFIC COUNTER

CLIP AND SLIDE

The creators of this project found a loophole in city law that says the area in front of fire hydrants can’t be used for parking—but they don’t have to be paved. That means they can put gardens there. The goal: turning 26 fire hydrant sites in San Francisco into mini gardens or bioswales. If every fire hydrant in the city had a mini garden in front of it, there would 10 extra square miles of green space, hence the name.

FRUIT FENCE

STREET SENSING