This is an interesting idea, its a ceiling that recreates the effect of a sunny day indoors. Called a SkyCeiling the ceiling creates the illusion that you are underneath a sunny sky and can be used to brighten up a room even it has no windows. It works by using high resolution photographs of the sky and overhanging trees which are suspended from the ceiling to create a 3 D effect. The photos are produced on transparent tiles and are lit from behind with high powered fluorescent lights. The system can be programmed to mimic the time of the day and different seasons. It is expected to be popular with offices and hospitals where it could be used to reduce stress and boost feelings of well being.