Klemens Torggler's door is an invention based on rotating squares, The special construction makes it possible to move the door sideways without the use of tracks. This technical trick opens up new applications for the door.

The caracal also known as the desert lynx, is a wild cat that is widely distributed across Africa, central Asia and southwest Asia into India. In 2002 the IUCN listed the caracal as Least Concern as it is widespread and relatively common. The felid is considered threatened in north Africa, and rare in the central Asian republics and India.