Tokyo Carpark

What do you do if you want to park 4 cars in front of your house but only got space for two? Well you get one of these contraptions.

The car on the bottom has to be moved manually by a human in order to fit a car on top. Not sure about this particular one but many of them are powered by motors and air pressure. If you want to park 6 cars in front of you house you can always get two of these...