Is it possible for a torch to light up a wall, but not reflect back to you so that you cannot in fact see the light hitting the wall? For instance I can see streetlights from a couple of miles away out of my bedroom window - therefore the light from the streetlights must be reaching me - but anyone looking at me will not be able to see the reflection of this light will they? Does this mean that we never really know how much anything is being lit up by any particular light without being the object it is lighting? Or am I just going down a blind alley here? I think what I am really trying to get at is how can we see things such as far off street lamps and yet their light is not seen to be shining on us, or lighting us up. I understand that this is probably incredibly basic for the majority of you on this board, but I hope at least someone will spare there time to answer it, Thanks, Stev.