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(1-1) A symmetrical universe.
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(2-1) Detail of The School of Athens, 1510, by Raphael (Vatican Museums and Galleries, Italy. Photo: © The Bridgeman Art
Library).
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(3-1) A complex particular (Photo: © Oleksiy Maksymenko Photography/Alamy).
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(4-1) Metamorphosis (Photo: © Eric Isselée/Shutterstock).
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(5-1) David Hume (Photo: © Paul D. Stewart/Science Photo Library).
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(5-2) Causation (Photo: © Tom and Dee Ann McCarthy/Corbis).
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(6-1) The direction of time (Photo: © Caroline Purser/Getty).
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(7-1) Could this machine split you in two? (Photo: © Paramount/Everett/Rex Features).
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(8-1) What is possible here? (Photo: © Stockbyte/Getty).
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(9-1) What caused this? (Photo: © G. K. Hart/Vicky Hart/Getty).
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(10-1) Immanuel Kant, Anonymous, c.1790 (Photo: © akg-images).
