The Air Danshin Systems company of Japan says it offers pneumatic technology to protect buildings in the event of an earthquake. The shaking triggers a stream of air that levitates the house. The diagram below, from the company, shows to some extent how the system works, with blue representing the stream of air. (The Spoon & Tamago blog gives some details in English.)
These two videos demonstrate how it works:
(Thanks to investigator Mark Dale for bringing this to our attention.)