So often people have concepts of what looks good and what does not.

Strange: http://en.wikipedia.org/wiki/Beauty

Beauty is commonly defined as a characteristic present in a person, place, object or idea that provides a perceptual experience of pleasure, meaning or satisfaction to the mind or to the eyes, arising from sensory manifestations such as a shape, color, personality, sound, design or rhythm.[1] Beauty is studied as part of aesthetics, sociology, social psychology and culture. Beauty, as a cultural creation, is also extremely commercialized.

The subjective experience of "beauty" often involves the interpretation of some entity as being in balance and harmony with nature, which may lead to feelings of attraction and emotional well-being.

In its most profound sense, beauty may engender a salient experience of positive reflection about the meaning of one's own existence. An "object of beauty" is anything that reveals or resonates with personal meaning. Hence religious and moral teachings often focus on the divinity and virtue of beauty, and to assert natural beauty as an aspect of a spirituality and truth