PLATE 3 Centrifugal atomization, one of several techniques for creating samples of rapidly solidified metal. (Reprinted, by permission, from Bernard H.Kear, 1986, Advanced Metals, Sci. Am. 255:159–167. Copyright © 1986 by Pratt & Whitney Aircraft.)

PLATE 4 Scherk’s first minimal surface shown in (a) is a model of the boundary between two polymers in a copolymer. An electron microscope image of an actual copolymer (polystyrene-polybutadiene) shown in (b) matches a projection (c) of Scherk’s surface. (Reprinted, by permission, from Edwin L.Thomas, David M. Anderson, Chris S.Henkee, and David Hoffman, 1988, Periodic Area-Minimizing Surfaces in Block Copolymers, Nature 334:598–601. Copyright © 1988 by Macmillan Magazines Ltd.)

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