First off... woo a physics forum. It's been a while since I have posted in a forum, but I couldn't resist a physics forum :) I just finished Richard Feynman's QED: The strange theory of light and matter. It brought up many questions, obviously, but the one I am currently trying to figure out is the seemingly paradoxical ideas that: a) light spreads out and.. b) photons have a tendency to attract to the same point in S/T and same type (the basis of a laser) a) seems obvious (a laser pointed at a distant target will be bigger than a laser pointed at a close target). b) on the other hand doesn't seem to actually play out. Do I misunderstand something here?