[@Rumplestiltskin] I think it sounds okay.  Objects would need to be about the same size, and within sight.  It seems like a special extension of teleportation for things other than one's self, to me.  I know I discussed that with Ryver or Xodus, but I forget the details.  Having them switch back is interesting, but I don't see it as necessary since teleportation is a thing.  Switching with nothing (or just air) is possible, since teleportation does not currently create a loud bang from the implosion or displacement of air.  Also there's probably an eventual size limit -- a building is probably a lvl 2 swap, for example.