Art as an investment vehicle.
"Such informal trading systems, where young artists swap their own work for art made by others, has always served this dual purpose of combining pleasure with diversified financial security. The idea is that at least one of the group will become a recognised and valued artist, and as such a broad arts portfolio is likely to contain at least one valuable work of art. Now, a multilingual globetrotting financier has formalised the system, making a quantum leap in the process, in the form of the Artist Pension Trust." -- BBC
However, if you really want to make a good investment, let the BBC show you How to Spot a Banksy for fun and profit.