The movies were like magic carpets, Mark Cousins tells us about his younger days, introducing Festival opener I Am Belfast at the Moviehouse Dublin Road. The film itself is a kind of magic carpet ride through the city, with Cousins as the excitable genie, showing us not a whole new world, but the same one, viewed from unexpected angles. Belfast, tilted. We begin in the clouds, coming down on the city from above, Cousins bringing his film-making eye to his hometown after a career spent Out There. Cut to a stained mountain face, raw and prehistoric, its reflection stretching outward in a pool…