Piscis-Viator ("Fish-Traveller" in Latin) is a symbol of wanderlust - a strong, innate desire to travel. The design of the "hot air balloon" was inspired by a story by J.L. Borges called "Bahamut" from his Encyclopedia of Imaginary Beings. Bahamut was the enormous fish, a beast of such immense proportions that no one could withstand the sight of it. All of the seas and oceans put together could fit into a tear in it's eyes.
Our little humanity sitting in a basket attached to Bahamut, contemplating, moving in an unknown direction...