Why was evolution concerned with beauty?

Through natural selection, organisms constantly progress towards a more advanced state. The end product is always mathematically and geometrically significant. Plants divide into fractals because it is the simplest way of producing self-similar pieces, bees tessellate hexagonal honeycombs to maximizes efficiency, etc. Even non-living things in nature have obviously mathematical forms, such as the randomized fractal of a snowflake, a result of water's molecular structure. As pattern seeking mammals, we have developed an appreciation for such order. Learning to recognize patterns is important in reasoning and is a vital step in our mental evolution. For example, take the natural language of colors, by which plants and animals communicate what is edible and what is poisonous. The aesthetics we appreciate in nature also reflect on those we seek in each other (curvature symmetry, etc.) Some features by which we define beauty are indicative of reproductive ability (estrogen/ testosterone levels, wide hips = ability to bear children, large = ability to nurse.) It has also been noted that women's appearances vary slightly throughout the month and they appear most attractive when they are most fertile. If nothing else, concentration on beauty prevents the spread of physical defects. Also, don't forget that evolution is adaptive, not progressive. Not all features gained through natural selection are distinctly advantageous. Some are just bizarre derivatives of the conditions we have had to survive and our complex psychology.