And don't forget that a wall doesn't have to cast a shadow. If you turn off "Cast Shadows" on a prop then it doesn't block the light any more. When working with "interior" sets, sometimes this is just easier, so you can use infinite lights and not have to worry about placing the actual light source inside the tiny room, which is a pain in my book.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)