Until relatively recently, Dublin had no IMAX cinemas. These days it has two, one in Cineworld, one in the Odeon at the Point. Hollywood releasing movies created with IMAX in mind is another relatively recent development—when the format was first introduced, it was filled with short novelty films, often in 3D. Well, full 3D IMAX films are here now, and Gravity is their standard bearer.
Spoilers below the cut, of course.