Seth Goldstein's Why Not machine is a glorious Rube Goldberg device that can tie (and untie) a necktie. It's a kinetic sculpture, slow and beautiful and inefficient in a way that can only be called artistic. It's headed for exhibition at the Franklin Institute Science Museum in Philadelphia. Its inventor, a retired engineer, revels in its unuselessness: "That's not something you can economically justify, but if you're a retiree, you don't have to worry about that anymore. I'm free!"

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