In design circles, there are a few things that might be considered "Instagram famous" — certain plants, to be sure; Luis Barragán interiors; Ricardo Bofill exteriors; the Atelier Brancusi replica at the Centre Pompidou; anthuriums. But in recent months, we've noticed three lamps popping up with such frequency that they might also be ascribed that title. Each lamp is vintage, but perhaps the more crucial thing they have in common is that each represents a trend currently winging its way through the design world.