Floating sculpture rises over the Greenway Half-acre net tethered between buildings to waft overhead until Oct. ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Dina Rudick/Globe Staff The vast net of rusty orange, magenta, and green hues will float above the Greenway until October. Dina Rudick/Globe Staff The sculpture, installed Sunday, was reflected in a nearby building’s windows. Dina Rudick/Globe Staff The sculpture emerged from an impossibly small wooden crate, hoisted, inch by inch and crane by crane, to span roughly half an acre in the air. Dina Rudick/Globe Staff Artist Janet Echelman checked out her giant aerial sculpture as it was suspended above the Rose Kennedy Greenway on Sunday. Dina Rudick/Globe Staff “It’s a bit of a coming-out party for public art on the Greenway,” said Conservancy executive director Jesse Brackenbury. Dina Rudick/Globe Staff Nadine Bonda (left)of Cambridge and Tom Shapiro of Belmont admired the new sculpture. Jonathan Wiggs/Globe Staff “I ask what is possible, and then the engineers tell me this is possible, and within that I start to design,” said artist Janet Echelman, 49. Dina Rudick/Globe Staff The sculpture’s three voids are meant to evoke three hills that once dominated Boston’s landscape but were razed to create landfill.