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How are shares used, and what are they, physically?
If you are particularly interested in the share certificate artifacts themselves, there is a collection hobby in paper share certificates and bonds, called scripophily.  This can include both active share certificates (for instance, think about giving your kid or grandkid a frameable paper share of Hasbro, Disney or McDonalds?), inactive certificates from famous bankruptcies or famous companies of the past, or just the visual interest in scrollwork and engraved vignettes.