This is not far from a real product in Japan: a toilet with a hand washing sink on the top. Presumably the water used to wash your hands is reused flush, saving

This is not far from a real product in Japan: a toilet with a hand washing sink on the top. Presumably the water used to wash your hands is reused flush, saving water. https://www.snopes.com/fact-check/sink-toilet-japan/ https://www.snopes.com/fact-check/sink-toilet-japan/