The museum also has a unique bell playing instrument – a carillon. A carillon is an instrument where bells are the source of sound. Only sets having at least 23 brass cast bells equipped with a mechanical keyboard for manual playing can be called a carillon. To date just 2 carillons are in Poland and both of them are in Gdańsk. One is in the Main Town Hall (37 bells in middle tone) and the other in the tower of Saint Catherine’s Church (composed of 50 bells