Love the Japanese idea of a window flush with the tub! Nothing says relaxation like a nice soak with the breeze :) (There'd need to be a tree or something though for privacy haha) . there is a Japanese Garden (patio) outside.
The Art of the Japanese Bath - Perched atop the cliff in Kanagawa Prefecture, this bathroom occupies southwest corner facing Mt. The custom-order Japanese umbrella pine bathtub sits quaintly in the middle of the space.