床が全部流れるトイレ。https://tumblr.osa-p.net/post/753167443215728640/%E8%87%AA%E5%8B%95%E6%B4%97%E6%B5%84%E3%83%88%E3%82%A4%E3%83%AC-%EF%BE%8E%EF%BE%8E%EF%BD%B0-self-cleaning-toilet-in-20
思考の /dev/null
