A witty, tightly written, and well-integrated look at our eternal struggles between order and chaos and the need to find a practical medium. Since the time the Creator in Genesis divided light from dark, Zerubavel (Sociology/Rutgers) says, we have continued to follow His example by structuring our own lives into territories, partitions, classes, and other ``discrete islands of meaning'' that are both comforting and constricting. This is especially true when such demarcations as white and black, Gentile and Jew, or homosexual and heterosexual pose more trouble than they are worth. Growing up in Israel during the 1950's, Zerubavel witnessed firsthand humanity's ``inordinate preoccupation with boundaries'' that are often self- imposed illusions. Here, he suggests ways we can ease our common ``fear of dissolving'' by being more tolerant of ambiguities and striking a compromise ``between the ocean and the bathtub.'' It therefore makes sense that his writing takes ``quantum leaps across mental divides'' with a ``gelatinous'' meld of psychology, theology, literature, theater, art, math, zoology, and even embryology in an attempt to help us open our ``ossified mental cages.'' He examines, for example, the open-ended criteria separating man from ape, the ambiguous civil rights of fetuses, and the multiple meanings behind Freudian slips, and offers ingenious analyses of iconoclasts such as M.C. Escher, Jorge Luis Borges, and Lewis Carroll--all of whom, Zerubavel says, challenged the ``solid entities'' of time and space. A bright overview unafraid to glean the beauty in ``blurred- edge essences'' and to expose the hazards of the rigid mind when nature prefers ``twilight zones.''