I believe I first heard this on a Radiolab episode, but I can’t remember for sure. Since hearing it, I’ve reflected on it many times and can’t help but think there’s some truth in it. For me it’s kind of why we’re just not that good at processing the scenery whizzing by from a car or train, and why cycling and walking are just about the best ways of getting around. Alain de Boton, in The Art of Travel, has some great observations about why trains are so great for thinking which I think has a lot to do with this - we have time to think, with a helpful intermission of the semi-connected landscape and houses passing by that we can only process for so long before we turn back to our thoughts. I love trains.