Scripophily, or the practice of collecting stock and bond certificates, is an interesting hobby.
When you buy a stock, you usually aren't really buying into a fraction of the company any more, but a piece of paper that says you can trade it's price. Most of the time you never see that piece of paper, since it costs over $50 to get from your brokerage.
Maybe one way a stock could be valued is by the quality and collectibility of the share certificate? If we consider stocks as a piece of art rather than a company, how do we value that stock?
Google a Monet?
Apple a Picasso?
Microsoft a Pollock?