On the photo you can see the Calendar that is part of The Prague astronomical clock (Prague orloj). The huge circular board with more than two metres in diameter was made of copper. It turns clockwise. The other calendar board is not rotary and you can view the municipal sign of Prague with golden fortifications and towers on it. The calendar board was made by the artist Josef Mánes in 1865. However, his board was later stored in the Prague City Museum and was replaced by the copy by Jan Kryštof Liška.