Crevice
What people really do not like in a bathroom? Cleaning! The more things they have the more they have to clean.
Why not to remove the washbasin?
Crevice is driven by silent motor, it is open only when water is running from the tap.
You can wash your hands and admire crevice, no drop of water will fall on the floor.
After closing the tap crevice closes and makes cleaning very simple - like cleaning the wall.