[dleviwing]

Originally Posted by AntonioLao Dave, About the symmetry, it is spatial symmetry or switching of space coordinates, you are there, I'm here, now we switched, I'm there, you are here.

Antonio;
Your comment of switching roles is what threw me. Switching positions, we can do, but I don't think you would care to be me nor I you in such a switch. There is much more to the symmetry but I get what you mean.
Thanks;