When sculptor Naum Gabo made a pioneering series of sculptures in plastic back in the 1930s, he was following the fine artistic principle of experimenting with a then-new material offering an intriguing combination of transparency and flexibility. What Gabo couldn't know was that his chosen material would warp and crumble over the ensuing decades. Today, sculptures like Construction in Space: Two Cones (1937) lie in fragments, consigned to store-rooms at galleries such as London's Tate Modern. "It's sad," says Bronwyn Ormsby, senior conservation scientist at Tate. "But all we can do is analyse it, and if it's gone, it's gone."

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