Prague
In the old square there is an ancient astromatical clock. When the hour arrives, 2 doors open and statues of the 12 apostles pass by, on each side there are 2 starues whose head and arms move and at the final strock of the hour a rooster above the apostles crows. The clock not only tells the hour but the month the position of the sun and moon plus the amoount of sun light. The blue in the picture represents sunlight, it turns to show relative to other months how much light and dark there is.