They are, in neurobiological terms, things that stimulate our reward system. That explains why parents tend to find their young children beautiful, and adults are attracted to nubile models and their images.
答案可能在我们中间。美丽的东西是我们可以从中找到并获得愉悦的东西。用神经生物学的术语讲，它们是刺激我们的犒赏系统的东西。这解释了为何父母亲总是认为他们的小孩很美，成年人总是被性感模特和他们的照片吸引。犒赏这些感觉具有进化意义。