With “Frequency,” the New York–based artist brings a series of painting and tension sculptures to the stunning vistas of Tuscany. At Orto Botanico Corsini, La Piana explores his dual heritage through six works bound to the botanical garden’s trees. The resulting vibration, sound, and movement activates the naturescape and brings a new kinetic energy to the natural world. At oceanfront Forte Stella, a companion show of 13 paintings and two additional outdoor sculptures continue the artist’s dialogue with forces of nature.