A delightful video here A lecturer derives special relativity in a world of bats and echo location using a bat (sound) clock. All communication is limited by the speed of sound. (so a parallel of our world and light speed communication) He ends up observing that in no cases for any observer can you ever measure a bat travelling at more than the speed of sound ...but obviously in reality a bat could at least theoretically be super sonic. Question I have then is if the parallel derivation or relativity is fair where does that leave our understanding of the universal limit of light speed ...seems at first glance to suggest that light speed limit is not a real physical limit at all. In this view the reason we can't make protons go faster than light in synchrotrons for instance is not because they can't but because we can't calculate how to do so ..or even if we guessed the magnets timing correctly to get the photon at 1.5c we could neither detect nor confirm it did so. of course that's different isn't it from what I understand Einstein's physics where C is a real - actual limit. e.g The infinite energy requirement to get to C then is our maths going haywire. Or is it? Thanks for any responses.