Some mages balk at performing spells during an ocean voyage, preferring
instead to dabble in sorcery in tiny rooms, precariously perched atop the aerie
towers that this sort of magician always seems to favor. The logic of this
preference has always eluded me. After all, should something go amiss with
either your spell or your relationship with your employer, just think how much
easier it is to swim than it is to fly.
-- The Teachings of Ebenezum, Vol. XXXVIII