Degrees of Perpetual Motion

According to my research, perpetual motion has two absolute degrees.

1. Over-Unity, and

2. Perpetual Motion.

However, there are intermediate degrees that consist of construction.

While the first degree is very difficult (see notes below), at the second degree it is tempting to abandon construction and rest on one's laurels, with half-finished machines everywhere.

(I am the only one I can think of besides Reidar Finsrud who may have reached the first degree, unless the Newman or Johnson motors work. I have inside evidence that a certain pendulum someone else built which was said to be perpetual was actually plugged into the wall, but this may have been constructed as a defense of the physical preservation of that machine).