There is no such thing as absolute motion or rest. This is because one can record the speed of an object moving relative to it and find that it is in motion. The same holds for the object in motion. An observer on the object will observe the other observer moving relative to him. The measured velocity of the observer will be equal to the measured velocity of the other. So, am I right in saying whichever observer I choose to be with, I will witness equal relativistic effects in the object undergoing relative motion?