Perpetual Motion Machine

The Perpetual Motion Machine is seen in the Museum in Ultima VI. It is a machine consisting of several wheels and poles, that keeps itself in constant motion with its own motion, meaning that it never loses any energy to the outside. In Ultima VII, the machine had vanished from the Museum with no explanation.

Of course in reality such an machine is impossible to build, as it violates the fundamental laws of energy and thermodynamics. Thus it can be seen as an joke made by the programmers.