Long time since my last time. I've found a system that seems to work in a kind of perpetual motion, BUT please, do not take it as SPAM message, and take the time to analyze the system. Imagine a container made of two cilinders communicated with a tube. We fill this container with ferrofluid with the same density than water (for example). Now the gravity and the pressure will be in equilibrium, so the ferrofluid is equally high in both cilinders. Now, we put a big magnet in one of the sides, so the ferrofluid level in one side goes higher than on the other side. Now gravity, pressure and magnetic field forces are in equilibrium for the fluid. Now, introduce a chain of buoys (every buoy weights 1Kg and has 2 Litres of volume). Then when in ferrofluid, buoys will float, and in air, they will go down by gravity. For the buoys, the effects of gravity and floatation will be different on one cilinder or another (force direction). If we have different ferrofluid levels on the cilinders, the buoys will be affected in a way to rotate the chain in a continuous way! The ferrofluid is affected by 3 fields (gravity, pressure and magnetic forces), but the buoys are only affected by gravity and floatation... so they see an imbalance, and feels different forces on one cilinder or another. I post a drawing of the system, and some other drawings explaining how it would work. What is wrong in the device (if there is something wrong)? Could you explain why the buoys should not run continuously?