A long time ago someone I know who was friends with a famous artist was invited with that artist to visit Walt. Walt decided to show the dealer some of his art, so he went to get it from the closet where it was kept. The art was not in portfolios, mind you, but simply stacked in a giant pile from floor to ceiling. I was horrified to hear this, thinking of the all the ways it could be easily damaged in such a setting (bugs, humidity, water, fire etc). The dealer thought it was no big deal, which confused me -- until I visited the dealer at his house and saw he stored art the exact same way