With red and white light, the shadow of the object appears in the complementary color -- cyan -- and the shadows change as your angle of vision changes.

CNN: What the brain draws from: Art and neuroscience

The nine-hour Belfast tour (an epic in itself) takes in sites around Northern Ireland, including the caves where red priestess Melisandre of Asshai gave birth to an evil shadow-baby assassin, and Ballycastle, setting for the Free Cities where the eunuch Lord Varys was born as a slave.

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Now he is back on the Tory front line as shadow deregulation secretary as Michael Howard uses him to spearhead his campaign to cut red tape.

BBC: John Redwood