According to the same concept as for metro entrances, as well as for the ticket office, the station is the climax of the concept of "urban clearing".
It is a question here, for the user, of informing him as he is on the quality of the sky there: is it the night, is it the daytime, is the weather beautiful or cloudy?
A device of projection on the vault of the station inform us in real time about the sky.
We try here to take up with the essential chronobiologie of the user by bringing elements of answer to this nevertheless essential question: what's the weather like?