Hi everybody, Glad to be with you, in the most popular physics forums on the Internet. First of all, I'm not a physicist and the problem I hope to get the answer from you, is part of the work I'm writing in another field. To cut it short, I don't quite understand how the relativity of simultaneity works without braking the laws of physics. My understanding is that one system must be in balance in all frames of reference, meaning that the chain of cause and the effect cannot be broken in any of the reference frames. Do I make sense I'll give an example with the ladder paradox. Mentioning the balance word, let us balance the garage on a triangle, and it will go out of balance in the ladder reference frame, which will make it impossible for the ladder to go through. If you think, we can create many such cases (not only with balanced on triangle garages), where the cause and effect chain will brake in the frames of reference where the simultaneity is not seen. The funniest of all such cases would be the flight of a bird Please help me with this.