 In one of the prototypes video the inventor puts a figurine of Björk (as pictured in the "Volta" album cover) between the swings.The instrument, created solely for the "Solstice" performance, was commissioned because, as Björk declares, the singer "got obsessed" with basslines (she hums a bassline of a composition by John Tavener as she says so).One of the major inspiration of the project itself, neurologist Oliver Sacks, who Björk define as the "David Attenborough of the brain", lists the benefist music has on human and explains how when a human listens to music every part of the brain gets involved.