Count the faces and you lose track. Four young men stare out from the cover of The Piper at the Gates of Dawn, but they appear three and four times each, ghosting into themselves and into one another so that an eye, a jaw, a fall of dark hair drifts where it shouldn't.

One figure burns in a scarlet brocade jacket over a white shirt; another glows in jewel-toned paisley silk; a third wears a heavily patterned floral coat shot through with metallic threads. Their hair is long and tousled, their gazes cool and unsmiling, and the whole frame swims in warm coppers, reds, and hazy silver-grey.

The effect came from a prism lens pointed at the brightest-dressed band in the room, shattering each portrait into overlapping fragments. It turned four faces into a kaleidoscope you still cannot stop counting, an image built to look like an LSD trip before a single note played. But who was behind that lens, why nobody was overseeing the look, and what became of the little piece of glass that did the work is a stranger story than the picture lets on.