Matt Duckworth Underwater: March 2016

Let's quote Edmund Burke on "Gradual Variation":

BUT as perfectly beautiful bodies are not composed of angular parts, so their parts never continue long in the same right line. They vary their direction every moment, and they change under the eye by a deviation continually carrying on, but for whose beginning or end you will find it difficult to ascertain a point. The view of a beautiful bird will illustrate this observation. Here we see the head increasing insensibly to the middle, from whence it lessens gradually until it mixes with the neck; the neck loses itself in larger swell, which continues to the middle of the body, when the whole decreases again to the tail; the tail takes a new direction; but it soon varies its new course: it blends again with the other parts; and the line is perpetually changing, above, below, upon every side. In this description I have before me the idea of a dove; it agrees very well with most of the conditions of beauty. It is smooth and downy; its parts are (to use that expression) melted into one another; you are presented with no sudden protuberance through the whole, and yet the whole is continually changing.

Observe that part of a beautiful woman where she is perhaps the most beautiful, about the neck and breasts; the smoothness; the softness; the easy and insensible swell; the variety of the surface, which is never for the smallest space the same; the deceitful maze, through which the unsteady eye slides giddily, without knowing where to fix or whither it is carried. Is not this a demonstration of that change of surface, continual, and yet hardly perceptible at any point, which forms one of the great constituents of beauty?

Selections from A Philosophical Inquiry into the Origin of Our ideas of the Sublime and Beautiful.
-- from Part II: Section XV, in particular

Edmund Burke, 1757.