“This is the squirrel condo,” Maya Lin says, pointing to an English elm tree pocked with holes, a ring of almond shells tossed like so many used takeout containers around its base. She’s standing in Madison Square Park, seven acres in Manhattan’s Flatiron District that encompass an oval lawn, a dog run, a Shake Shack, and a reflecting pool lined with benches. Lin has a soft spot for squirrels, and she got to know this crew last spring while installing Ghost Forest, an art installation that ends its six-month run in mid-November.

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