The other day, I was sitting outdoors and started playing with my shadow out of boredom. That's when I noticed that when I moved my head near my knee, their respective shadows connected even though my head and knee weren't touching. I'm guessing it has to do with the angle between me and the sun and that the sun's light is more like a thick beam than something emanating radially from a point-like source. I'd just like a proper explanation for this phenomena. Also, why do lights appear to flatten out (make lines the same color as the lights across your entire vision) when one squints or when a movie camera captures a scene with bright lights?