This weekend, The Belcourt’s retrospective of the works of Michaelangelo Antonioni serves up the Italian master’s most famous film. (And when I say “serve,” I refer to an invisible tennis match ... a Blow-Up joke, everybody!) Seriously, though. Antonioni’s first film in English is an arthouse paradox, an enigmatic yet wildly popular success — it earned the director an Oscar nod and racked up big box-office in 1966. What attracted the masses was the racy depiction of Swinging ’60s London, with birds in candy-colored tights ready to doff their tops at the drop of a hat for sexy, sulking fashion photographer Thomas (David Hemmings). The title refers to Thomas’ darkroom obsession with the whorls and shadows of a photo he snapped — which may reveal a murder. The cast, meanwhile, is a visual dictionary of mod-era icons — Jane Birkin, Veruschka, Vanessa Redgrave, Vera Miles. You can see Blow-Up as art, cultural landmark (it helped redefine the way we view the mystery and fallibility of photographs) or just a 50-year-old whiff of a Carnaby-era spliff. Hear Herbie Hancock’s hot grooves! Watch Jeff Beck of The Yardbirds smash his guitar! And don’t forget the mimes!