Color by Numbers is a permanent light installation in the tower at Telefonplan in Stockholm. With this app you can change the colors of the light in the tower. The tower is 72 meters high and has 20 floors, of which the top ten are used for Color by Numbers. The light installation is visible in large parts of Stockholm, within a radius of just over ten kilometers.Select the floors you want to color by tapping on the floors, or dragging your finger over them. Correspondingly, you deselect floors. Color selected floors by spinning the color wheels. You can create any color by mixing red, green and blue.Share live photos of your coloring.www.colourbynumbers.org