It looks like a normal door, until you touch it. A kinetic art prototype designed by Austrian artist Klemens Torggler evolved into a system called the Evolution Door, a “flip panel door” (Drehplattentür) that uses the force of gravity for the opening mechanism: //The key principle is similar to a balance in the vertical position. In a door consisting of two parts, gravity causes one half to rotate. The physical work is redirected and causes the second, equally heavy door-half to move against gravity. To open and close a gentle touch is all that is needed, after that physics takes over.// Open Sesame!
