Look closely at the cracked blue sphere and you'll find faces trapped inside it. Across a lattice of diamond-shaped cutouts, each opening like a window punched into the curve of a planet, small figures press their palms against the dark, fingers splayed as if testing the inside of a cage. Pale doves and seagulls drift through the cloud-streaked turquoise, and the whole image seems to hang in infinite space, a world turned over and over.

This is Tommy, the early rock opera by The Who, and the people staring out from those black diamonds are the band themselves. Yet they were never meant to appear at all. A single painting had been built to carry the whole album on its own terms, and the portraits arrived only later, dropped into a design that had not asked for them.

The eye still goes first to those tiny lit windows, to the hands pressed flat against the dark, searching for a way through. How that image came to hold both a spiritual diagram and a rock band at once is the rest of the story.