I was looking out the window of a bus yesterday and noticed the hoar frost on the snow bank. It's beautiful - it looks like the pelt of some huge beast or maybe alive, like coral. I started thinking of other beautiful things in nature like snow flakes and the patterns that frost forms on car windscreens, and not just freezing water examples but the shapes of trees, the songs of birds (okay, maybe not everything - e.g. the caw of a crow isn't necessarily beautiful but it doesn't hurt the ears either). Why do we find things in nature beatiful?