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This t-shirt spells out "Hate" until you see it in a mirror, then the same cleverly formed letters spell out "Love". I don't know if this t-shirt is for sale or merely conceptual/art, but I think it's terrific.
Link
Update: Alex sez, "That shirt was designed by Rachel Plefger."
Update: Khurram sez, "they're based on a form of writing called 'ambigrams', which appear to say one thing forward, and another thing when read in a mirror."
Update: David sends us this clever Love/Hate optical illusion tee
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.