Hello, I have a question about special relativity. According to the Lorentz transformation, if a coordinate system K' is moving with respect to a coordinate system K, then a rod fixed with respect to K' will appear to be more lengthy with respect to K than that with respect to K'. The equations are true .. Ok, but I don't understand the rationale behind that. Why does the motion change the measured length? If somebody can give me a real world meaning, I will be very thankful.