Join Davida Carvin and Reese Berman for a moderate-paced 3 ½ mile walk along a section of the Emerald Necklace, from the Back Bay Fens to Jamaica Pond. Along the way, you’ll see the extraordinary “fog sculptures” of artist Fujiko Nakaya. Placing art in conversation with nature, Nakaya’s installations create shape-shifting, cloud-like, pure water forms that rhythmically appear and dissipate. Lunch in JP. Return on Orange Line. BHV members and their guests. Free. Take the “E” branch of the Green Line to the MFA stop on Huntington Avenue.The group will meet at 9:30 a.m. at the corner of Huntington Avenue and Louis Prang Street(the MFA stop is between Louis Prang and Museum Road).