It doesn’t require a brain cell to guess the thing atop the bowl is probably a washing machine. Submitted to the Green Gadgets Design Competition in New York City (Feb ‘08) by Sevin Coskun who is not from Japan (he’s Turkish), this design called Washup is commonsensical. Laundry water is recycled for flushing. 

Verdict: “Honey, I put the laundry into the bowl. Oops.”

(Now, hey, I have nothing against Japan, man. But because Japan is teeming with inventors and is sufferring from space shortage, we’d also be expecting a lot of weird inventions from it that combine many functions of household items. Washup is so Japanese.)