Journeys are the midwives of thought. Few places are more conducive to internal conversations than moving planes, ships, or trains. There is an almost quaint correlation between what is before our eyes and the thoughts we are able to have in our heads: large thoughts at times requiring large views, and new thoughts, new places. Introspective reflections that might otherwise be liable to stall are helped along by the flow of the landscape. The mind may be reluctant to think properly when thinking is all it is supposed to do; the task can be as paralyzing as having to tell a joke or mimic an accent on demand. Thinking improves when parts of the mind are given other tasks—charged with listening to music, for example, or following a line of trees. The music of the view distracts for a time that nervous, censorious, practical part of the mind which is inclined to shut down when it notices something difficult emerging in conciousness, and which runs scared of memories, longings, and introspective or original ideas, preferring instead the administrative and the impersonal.
Of all the modes of transport, the train is perhaps the best aid to thought. The views have none of the potential monotony of those on a ship or a plane, moving quickly enough for us not to get exasperated but slowly enough to allow us to identify objects. They offer us brief, inspiring glimpses into private domains, letting us see a woman at the precise moment when she takes a cup from a shelf in her kitchen, then carrying us on to a patio where a man is sleeping and then to a park where a child is catching a ball thrown by a figure we cannot see.
[…] Every time my mind goes blank, having hit on a difficult idea, the flow of consciousness is assisted by the possibility of looking out of the window, locking onto an object and following it for a few seconds, until a new coil of thought is ready to form and can unravel without pressure.
At the end of hours of train dreaming, we may feel we have been returned to ourselves—that is, brought back into contact with emotions and ideas of importance to us. It is not necessarily at home that we best encounter our true selves. The furniture insists that we cannot change because it does not; the domestic setting keeps us tethered to the person we are in ordinary life, who may not be who we essentially are.
Alain de Botton, from The Art of Travel.