In Deuses pequenos, de Terry Pratchett, a seguinte citação aparece:
It was something he shared with tortoises. Watch any tortoise walking, and periodically it will stop while it files away the memories of the journey so far. Not for nothing, elsewhere in the multiverse, are the little traveling devices controlled by electric thinking-engines called “turtles.”
A que se referem os "pequenos dispositivos de viagem"?
