Is it possible that concepts of relativity are just a mathematical tool, but reality is simply classical if you understand one more piece of the puzzle? I'll try to explain. For example if somehow everything is made up of light processes (going at the speed of light), but if you accelerate these objects the light processes have to remodel and thus cause time dilation and length contraction. A simple model would be two parallel mirrors where light bounces back and forth. If these mirrors accelerate, the light effectively goes a different path and thus the time of one light ray round trip change. This causes the time dilation. Btw, for some orientation of the mirrors it actually yields exactly the Lorenz time dilation. So, accelerating the structure in absolute space changes the internals of objects which cause time and length changes. There would be absolute space and time travel wouldn't make sense. Is there an argument against the idea that everything is made up of light and relativity an illusion?