A cluster of grey metallic spheres, strung together by thin rods, hangs against a deep blue field like a molecule frozen mid-diagram. The shape resembles the Atomium, the modernist structure raised to commemorate the 1958 Brussels World's Fair, and across its center runs the band's name in flowing red script, the one warm mark in a coolly engineered picture.

It looks like science, but it began as something far more intimate. Dave Grohl was only half-joking when he admitted that the cover almost featured a psychoanalyst's couch instead. The idea traced back to a realization he had while ordering the songs, that the finished sequence played out less like a rock album than a course of treatment.

What replaced the couch is stranger and quieter: a scientific object standing in for something emotional, structure imposed on a turbulent moment. The spheres invite a question the sleeve never answers out loud. Are they atoms, or are they people, and why do the rods that connect them feel less like bonds than tensions held in place?