– The Cone of Vision
Human vision has specific limitations. When we look out toward the horizon, the depth of our vision ends, somewhere in the distance. It’s not as apparent, but we have limitations of height and width as well – if I stretch my arms out on each side and look straight ahead, I can’t see them. If I hold my arms straight up, again I can’t see them. Obviously, I can’t see what’s behind me. We don’t notice these limitations, because we easily compensate for them. First, our eyes dart around very quickly. If that’s not enough, we use our necks to aim our eyes in the right direction. When even that isn’t enough, we’ll use our bodies to turn around to see what we couldn’t see otherwise. So, while there’s a specific boundary to seeing, it’s not something we’re particularly conscious of.