The Kajima Corporation of Japan has a very cool method for demolishing buildings. Instead of the implosion method commonly used to bring down buildings, they do it one floor at a time, by inserting computerized supports as they dismantle the first floor, and literally lowering the building one floor at a time as they demolish. The benefits: saves time and space, pollutes the air less, and makes material recycling easier. Kajima calls this the daruma-otoshi method, after an old Japanese game in which players knock out stacked pieces of a doll one-by-one without toppling the doll. See the time-lapse video below.