Watch Document 72 Hours Season 4 Episode 4 Online

A mood-detecting dog collar? A wind instrument with a keyboard? You'll never believe the ideas blooming at this workshop in Akihabara. For around $120 a month, members get space to work and access to 3D printers and other cutting-edge tools. Among the users are ham radio enthusiasts and inventors hoping to become the next Steve Jobs. Some even get the chance to present their ideas to investors. We spent 3 days at this creative playground in the heart of Japan's otaku culture.