I was looking at the barn door paradox, http://math.ucr.edu/home/baez/physics/Relativity/SR/barn_pole.html But supposing that instead of a barn, there was a piece of measuring apparatus which was in two halves, with a gap in between through which the pole would pass. One half of the measuring apparatus has a laser at each end (these correspond to the barn doors), and that the beam of each would be broken by the pole as it passed. The other half (the receiver) has a light detector at each end, each of which detects the beam from one of the lasers. These detectors are linked by fibre optic cable to a NOR gate that is situated in between them, equidistant from each in the measuring equipments rest frame, and the NOR gate is connected to a light bulb, such that if in the rest frame of the measuring apparatus you were to break both beams simultaneously there would be a later point in time where the NOR gate simultaneously did not receive a signal from either light detector, and would turn the light on. At first glance I would expect the light to not be expected to come on by an observer from the measuring equipments rest frame but be expected to come on from an observer from the poles rest frame, but I realise that would mean there would be an experimental difference, so was wondering what the expected results would be? Would it be something like the NOR gate not being equidistant from each detector in the poles rest frame?