You look at a statue from hundreds of years ago, or a cave painting from thousands of years ago. You listen to clssical music from many generations before you were born. You think: "Art is forever," until you see Simon Beck's snow art, that itself never lasts overnight.

http://www.npr.org/blogs/13.7/2013/12/22/251615317/the-amazing-snow-art-of-simon-beck