Grim's Hall

The Future of the Past:

In the early 1960s, curators at the Philadelphia Museum of Art noticed something funny about one of their modern-art sculptures: It smelled like vinegar. Worse, the once-clear plastic sculpture had begun browning like an apple, and cracks had appeared on its surface. By 1967, Naum Gabo's translucent, airy Construction in Space: Two Cones looked like Tupperware that had gone through the dishwasher too often.

I think I've talked about this before.