简答题:根据以下材料，回答46-50题
Aesthetics, as a discipline, retains a bond with its origins in the eighteenth century, when it was named the "science of sensory knowledge".(46) Much has come to supplement this sensory base-factors such as meaning, memory, metaphor, symbol, and history—but it is important to reaffirm the central place that sense perception holds in aesthetic experience, for the senses are essential and indeed central to the study of art and natural beauty.Of course, the early emphasis of aesthetics on beauty has changed with the evolution of the arts, and today the field embraces a wide range of qualities and features of perceptual experience that may be termed, in some fashion,"aesthetic".These include the ugly, the absurd, the comic or playful, as well as the conventionally pleasing.In fact the concept of beauty may itself be extended to cover such as these, in so far as they enable us to have experience that is both positive and aesthetic.
The nature of such experience has understandably been the subject of much discussion.Aesthetic experience has been approached from the naturalistic, the analytic, and the phenomenological standpoint.(47) In fact, so important has the notion of experience been in theories of art that it may be taken as the far-reaching concept in modern aesthetics.Drawing from some of these sources, I shall develop here some ideas that have significant implications for an aesthetics of environment.
Aesthetic perception is usually described in visual terms：we are given not an aesthetic of experience but an aesthetic of appearance.(48)The sense of sight has a long history in Western cultures and, throughout the twenty-five hundred years of its philosophic tradition, it is well known how visual perception has been dominant and sight has been associated with cognitive activities.This is seen clearly in the standard stock of visual metaphors that provide the usual vocabulary for denoting acts of thought and cognition.(49) These are familiar which confirms the truth of ideas that the mind perceives as "clear and distinct" in "the light of nature", to the multitude of metaphorical commonplaces.This convention has been transferred readily to the arts,so that sight, along with the other distance receptor, hearing, is the only sense traditionally admitted as legitimately aesthetic.(50)For Plato proposed early only the pleasure apprehended by sight and hearing is aesthetic, and this conviction has been repeated until recently without serious question.
第49题的答案是