Cars in the Sky

Air is Valuable, originally uploaded by AdrielH.

Parking is expensive and rare in Tokyo, including in the suburbs (it is an old city with narrow streets). Little space is wasted. In addition to schemes like this one, it is common for small businesses to have electric roundabouts for squeezing more cars into tight lots.
I also have noticed that many department stores have a few levels of parking as their top floors, which never seems to be the case in California. Not sure why.
Another ubiquitous quirk of parking in Tokyo is that folks back into their parking spots as a rule. Again, not sure why.