This Is How We Do Klaus Ahlund, I really enjoyed working with them. The different kind of sonic level of music that's been made over in Sweden is very advanced and it's very fresh... they kinda know what is coming first." About working with Perry, Ahlund stated, "When you move around the planet, the vibe of the place you're making the music in definitely makes an imprint on whatever you're writing." While co-producing nine tracks on "Prism", Martin and Åhlund worked together on two tracks: "Walking on Air" and "This Is How We Do". The first was released as a promotional single, while the latter
How many angels can dance on the head of a pin? about how many could perch at the same time on the head of a pin"". Dorothy L. Sayers argued that the question was "simply a debating exercise" and that the answer "usually adjudged correct" was stated as, "Angels are pure intelligences, not material, but limited, so that they have location in space, but not extension." Sayers compares the question to that of how many people's thoughts can be concentrated upon a particular pin at the same time. She concludes that infinitely many angels can be located on the head of a pin, since they do not occupy any space there: