In the museum's sculpture garden is another gift from the Broads: the treelike, stainless-steel "Containment 1" by Roxy Paine.

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Elsewhere in the gardens, 18 "supertrees, " artificial treelike structures between nine and 16 stories high, will offer shelter from the blazing Singapore sun.

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When the food was toxin-free, the possums spent an average of 40 minutes of every hour eating safely under treelike cover and only 20 minutes in the risky, ground-like enclosure, and that scarcely changed for 1% and 2% cineole.

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