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Just a thought that nags at me.

In The Colour of Magic, it is established that Rincewind has an alter-ego on Planet Earth (Roundworld). When he manifests on Earth out of his desire not to be killed by falling through a dragon that has just lost corporeal integrity at great height, he re-appears inside an airliner. (Either he is transported to Earth or a little bit of Earth is temporarily relocated to the Discworld. As all appears well on the plane and the pilot isn't babbling about "where the Hell am I?", I would suspect they are temporarily transported to Roundworld and everything is going according to schedule. (Until the Luggage turns up)

Dr van Rijnswand, (who perplexingly has a South African-sounding name but is given Swedish identity), has a few confused thoughts about dragons and some outlandish "hublandish" language, as well as a moment's confusion about the weird clothes, but inertia soon restores his full Roundworld identity with the odd thoughts being dismissed as some sort of dream.

The question is - if Rincewind is sent into Roundworld to explore and discover, how come he doesn't assume the aspect of himself which is already there, and forget his Discworld identity? (Would this only apply during the brief span of Dr van Rijnswand's lifespan on Roundworld?) In which case he would have had the Professor's knowledge of nuclear physics to confuse the Faculty with.

This may also be a temporal paradox - the wizards have not called Roundworld into existence at this point, so it is possible Rincewind and Twoflower's personal timeline was wound forward to the time of the Roundworld for this brief span, and then back again on their return to the Disc.

The mind fairly boggles...--AgProv 15:45, 3 May 2007 (CEST)