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Book Review

Nature 422, 264 (20 March 2003) | doi:10.1038/422264b

Open Innovation Challenges

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A relative view of the Universe

Spanish surrealist painter Remedios Varo created the metaphor shown here for Einstein's space-time Universe in 1963. The Phenomenon of Weightlessness, as it is called, is one of over 300 illustrations in Exploring the Invisible: Art, Science and the Spiritual (Princeton University Press, $49.