The first thing your eye does is search for a face, and the cover refuses to give you one. Two figures stand against a wall of corrugated metal shutter, hit hard by a camera flash. On the left, a slight figure is bent forward almost double, straight black hair falling like a curtain over where the face should be. On the right, a taller figure stands upright but just as anonymous, a navy-purple hood yanked over the head so the features vanish entirely into shadow.

Nobody looks at you. Nobody is even trying to. This is the self-titled debut by the duo Crystal Castles, a picture built entirely around the withholding of a face.

And yet the image most people attach to this album is not the two hooded figures at all. It is a painting: artist Trevor Brown's 'Bruised Madonna', a pop icon rendered with a black eye. Two covers, two ways of hiding, one of them dragged into a courtroom. To understand why that unwillingness to be pinned down feels exactly right, start with what the photograph actually does to your eye.