A fun trick is to paint the inside of a box with a lid a bright colour (we had orange), cut a small hole in the side, and ask people what colour the inside is. When you look through the hole, it is black (completely black, rgb 0,0,0). Lift the lid so there is light in there... colourful! (I know, completely OT now, but still a fun trick).

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Ignore the shooty dog thing.