This contains an allusion to the Bible verse of Ezekiel chapter 1:1-28 where a large wheel/cloud (depending on text) appears to Ezekiel and gives him instructions from God: «A gathering of angels appeared above my head. They sang to me this song of hope, and this is what they said… (later in song)… I thought that they were angels, but to my surprise, they climbed aboard their starship and headed for the skies.» Some people believe the figure Ezekiel saw was not a messenger sent from God but an alien space craft or a time machine from the future. (thanks, tommy – indianapolis, IN)