Looking at the horizon relaxes your brain. That's why walking outdoors oftentimes helps your thinking.
Have you ever noticed how your mind feels calmer when you're looking at the horizon?
When you look at the horizon, your visual field expands. According to neuroscientists, this broader view activates the parasympathetic nervous system, which promotes relaxation. In contrast, tunnel vision (like staring at a screen) heightens arousal. That's helpful for concentration but can also keep your nervous system on edge.
This might explain why walking outdoors, especially in open areas, often feels mentally refreshing and helps people think. Aristotle and Darwin famously both used walking as a tool for thought. Aristotle taught while strolling, inspiring the term "Peripatetic," and Darwin walked his "Sandwalk" daily to reflect on his theories.
Essentially, you're not only moving your body but also your attention. The visual broadening helps your body downshift from "go-go-go" to "pause and reflect."
So while walking is often praised for boosting creativity, maybe it's not just the motion. It's the view field expansion that creates space for reflection and insight.