A geodesic dome that looked as if it might have arrived from outer space took the place of a tent at Erdem this afternoon. The structure was a subtle hint at the otherworldly happenings about to occur inside. Zoom in on the designer’s inspiration board this season and more extraterrestrial clues emerge, including the work of 1950s science-fiction novelist Zenna Henderson. “I was thinking about a woman from another planet coming down to earth,” said Erdem Moralioglu backstage after the show.