City life can be a little gloomy, with the stress of professional life, the winter and all the concrete. What could we do to break the gloom?

We collaborated with JC Deacaux Innovate to build something special: the first billboard that generates a real rainbow with rainwater.

Two times a day, in the morning and in the evening, when the sun is at an angle of 30°, the billboard generates an actual rainbow.

It has been installed in the dull but busy places in the city and is signed: "Bye bye grisaille" (goodbye grayness).

During a week, Monoprix offered to thousands of people going or coming back from work, a rainbow and some optimism.