Art market which is also called art and antique trades market mostly available in auctions.
Christie's and Sotheby's are the well known auction houses.
Many fine and applied art galleries sell art too.
Estimated market value is 60 Bln USD
It is not small market. partly digitalized as online sales.
An art gallery in London Cork Street already accepting BTC, ETH, LTC, DASH and Monero.
Some collectors prefer privacy and do not want declare their identity to public.
Bitcoin and other coins can be good opportunity for this market.
Using crypto currency can provide privacy and can provide better transaction costs. Imagine that If a gallery or a collector buy a Rembrandt, how much will be transaction fee of few million USD ?
Some items are too expensive to buy, even for some galleries who have financing difficulties.
Shares of a well known some paintings can be sell via crypto currency. Who wants to buy %1 ownership of Mona Lisa ?
This can provide easy to create secondary market of fine art paintings without disturbing by country basis local jurisdictions.
just giving idea to marketing teams of crypto currency projects.