Imagine that you're in a very dark tunnel, and there's a tiny light at the end of it. This light is so small that it looks like a single point, a dot. You move closer towards it, and it doesn't change. You move further away from it, but it's still the same distance from you. It's just a small, brilliantly lit dot of white light: Forward or back (1 D) Suddenly, you get a … [Read more...]