15. Cistern sinks
Toilets can be pretty uneconomical, to the point that many people will try to conserve water by only flushing when really necessary. Japan, however, has solved that problem with these super-eco-friendly cistern sinks, which mean that you can use the water twice. Pure genius.
14. Fully automated stores
Sure, self-serve checkouts are becoming a lot more commonplace these days. But in Japan, there are whole stores where absolutely everything is automated, meaning that you never need interact with another human at all after going through their doors. Introverts, unite.