The fact that The Beatles and U2 come together at this point to a Black and White cover is significant considering the explosion of color that both bands experience in their next albums (Sgt. Pepper, Achtung Baby). Coming to monochrome sleeves at this point it’s sort of like the calm before the storm, or the compression of energy before the big release of the explosion. This harmonious development could be ascribed to a synchronized respiratory movement between both bands. We can consider ‘black-and-white’ and ‘color’ as opposites, in the same way as ‘breathing-in’ and ‘breathing-out’ are, and observe a parallel synchronized movement of expansion and contraction, growth and crisis, as progress develops in the careers of The Beatles and U2.