There are artists who reach a certain level and no matter what happens in the market, they will always be popular. Andy Warhol is a good example - he's just reached such a stratospheric level. But in terms of everything else in the home, I think it comes down to the magic word of quality. If you've got anything that's really high quality, or rare, it becomes desirable, because it holds value and people collect across different markets. So the rarest works, the rarest coins, the best quality furniture, and the most sought after prints. Those are the things that always hold their own.