The cardboard piece imitating a part of the wall with merlons has pictures on both sides. One side depicts a stone wall with merlons, and the other side shows either the same stone wall or a latticed window, typical for medieval castles and fortresses. The upper part of the cardboard element should be slightly folded, so that the merlons protrude forward slightly, and then it can be secured to the plastic panel, better a transparent one. To ensure a tight fit between the cardboard and the panel, the cardboard has small slits, and the panel has small pegs.
