This summer in Wakehurst, visitors are instructed to pause, breathe, and listen. Across the museum grounds, six installations explore sounds from the surrounding environment and its wildlife. In the Wetlands, the award-winning Kathy Hinde has arranged metal horns that reveal subaquatic voices. Nearby, in the trees, Marco Barotti has placed robotic woodpeckers, activated by your own mobile phone. And then there are self-generating woodland compositions, a sonic meadow, and water-balance chimes, all creating aural paths into secret realms. —E.C.