The Physical Impossibility of Death in the Mind of Someone Living (the Shark in a Tank one) had to be redone at some point as the Shark was deteriorating. I'm not sure he wants the work seen if it is getting grubby and all that as it should be experienced as the artist intended it to. I'm also not making a case for him as an artist but fuck me he knows what he is doing and a fair bit of that is related to the stupidity of the art buyers and investors who drive up market prices, he is in my opinion exploiting the rich and often gullible so fair play to him. He is also by far the most discussed and influential artist of our time.