Looking up constantly while walking sounds like a recipe for disaster.
My instinct, and what I actually did for many years, was to look down at the ground when I walked.
I noticed it, or someone else noticed it and told me I did it, and now I make an effort to look up. Now, I'm less stressed about looking someone in the eyes, so I always look at the faces of those coming toward me. There for a while, I would do that, but I would get spooked if they looked back at me and I would look away quickly. Now I look at them, and if they look back at me, I will lock eyes just for a second and smile or nod as the situation demands (fyi, women usually get smiles, men usually get nods, )
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Iamscientist
Truth is, I'm not a scientist. I'm an analytic philosopher, but we like to think we're scientists.