"Alan Parsons was inclined to select ideas around which to weave an album...In this case his On Air album was about the idea of flight or man’s desire to fly. It was, he said, as much about the idea of flight as about flying itself or about the machines that fly us. I took the notion of an idea, the tried and tested notion, namely that of a light bulb above a head and reworked it as a bulb shaped hot air balloon above a head shaped hillock." -- Storm Thorgerson
Release Notes - The 20/20 Series
Storm created a series he called "20/20" that was comprised of 20 of his favorite images. Each piece was published as a limited edition of only 20 pieces (plus 2 Artist Proofs).
Most certainly a play on the phrase "20/20" referring to perfect vision, the set was designed to showcase some of the pieces he valued most, including many of his more obscure album cover images.