I was surfing digg yesterday, and saw the following post: http://images.wildammo.com/2010/07/24/world-energy-problems-solved/ [Broken] For those who don't recognize it, it's based off a video game called 'portal'. In the picture, the water falls towards the floor where it falls through the blue ring, and is then teleported out of the orange one above. This forms a semi-closed loop in which the water constantly accelerates, and this can be harvested by a water wheel. Here's an example of how portals work: --- Now this got me thinking; let's assume that such a connected pair of portals existed, and that they did not require any external form of energy to operate (or perhaps they do, but there is ample energy available from some undefined source). Now say that they are placed one above the other as above, but this time in a magnetically-shielded vacuum chamber. If we were to drop an object down the hole, it would gradually accelerate to relativistic speeds; this much I know. Now the tricky bit. Say that instead of just dropping some generic object, we were to drop a very large fixed-magnet down the hole, such as a 2 foot by 5 foot neodymium cylinder. Surrounding the magnets 'flight' path is a toroidal induction coil designed to harvest electrical energy from the alternating magnetic field. Would such a setup work? Or would there be a cancellation effect from the bisected magnet? Another line of thought comes from whether or not portals can propogate magnetic fields or not. They can transmit light, so I imagine that the field strength would behave like an infinitely long string of such magnets falling through an infinitely long stack of rooms. The magnet would also experience a substantial amount of drag from interactions with the coil. I'm also wondering if the magnetic field would increase as it accelerated, or if it would remain constant. Any thoughts? I've posted a (laboriously created) image of my setup here: http://i.imgur.com/2UHpR.jpg Cheers!