You know that look… when someone is staring into the distance, but not looking at anything in particular. Sometimes associated with deep thought — or a complete absence of thought! You wave your hands in front of their eyes: “anybody there?” — then they snap back to reality.
Why do humans do that? What’s happening to the eyes, exactly, that we recognize that “look” as such? Is there an actual term for it? What’s the relationship between the brain and the eyes in that context?