This is something trivial that has been bugging me for a while. When someone is far ahead of you on a sidewalk, you see their arms swinging and feet beating the ground. But how can you make out if they are walking towards or away from you?
Suppose that I don't want to stand still for thirty seconds to see if they're getting closer.
Suppose that I don't want to stand still for thirty seconds to see if they're getting closer.
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