The main theme of the album is disappearance , as Hammill told British music magazine Mojo in February 2009 : " it became apparent fairly quickly that strong thematic links were running through the songs ' lyrics : disappearance , change , loss , dislocation in various forms were stitched through all of them . " Another topic reappearing in several songs is the one of the World Trade Center along with images of planes , though Hammill denied " any direct " reference to 9/11
9/11
September 11 attacks
Thin Air (album)