https://www.sterlingcrispin.com/
'No physical artwork exists, but a description of an artwork exists. The algorithm automatically re-evaluates the description every 10 minutes, adjusting the price of the artwork accordingly. It is possible to make a copy of this artwork by making a bid that is too low for anyone else to outbid. The minimum price at which someone could copy this artwork would be the price at which they could no longer sell it for a profit.'
