This is a very long article from the pages of Edge.org, a site that anyone with any curiosity whatsoever should visit at least once a month.

In the article, 192 scientists, philosophers, writers and others answer the question above.  Many fields and many points of view are represented.

What I ask of you, the reader is that you read the responses and keep track of the questions in your mind.  Saying "I like" or "I don't like" is too easy.  Asking good  questions takes a lot more effort.

Follow the link.  Read.  Enjoy, and come back here to discuss your questions.

http://www.edge.org/responses/what-is-your-favorite-deep-elegant-or-beautiful-explanation

Joe