Imagine—as you probably do now and again—that you are God, laboring under the self-appointed task of creating an Eve who will be accounted beautiful at all times and places. History shows you will be disappointed in your effort. Rather than a stable set of features, physical beauty is an ever-morphing construct, a fickle collective dream that we fall into once in a while.

But as slippery as our fleshly aspirations may be, they tend nevertheless to have outlines. These have been most visible throughout history in the pictures drawn by those self-elected gods we call artists. History provides us a record, and from it one basic, inescapable, and ultimately unconscionable truth stands out: the ideals women are asked to embody, regardless of culture or continent, have been hammered out almost exclusively by men. This fact, more than any sort of evolutionary determinism, has meant that a fairly narrow range of attributes resurfaces across eras, returning every couple of decades or so like a new strain of the flu.

Physical ideals are changeable, manifestations of the cultures they come from, yet some aspects change more readily than others. Even when produced by those of their own gender, images of women have historically followed a pattern set down by males. Little about Artemisia Gentileschi’s Sleeping Venus (1625-1630), for example, suggests its female maker. In it, as in virtually all pictures of women, passivity is the norm, whether manifested as softness, slack musculature, or a deferential pose. Another abiding trait, the outline of the hourglass, reminds us that the Female is always a sort of clock, which we try to freeze at the moment of youth.