That's the thing about travelling on a train: you can't focus on the detail and the bigger picture when you look out the window. Turn your head quickly enough and you've captured a moment while the landscape flies by. Focus on the middle-distance and the foreground is a blur. This is undoubtedly a metaphor for something. The fact that I don't know what it's a metaphor for is probably also a metaphor. Or a sign of trying too hard.