sentences:  In 2008, the band wore a set of large masks titled "purgatory masks" during photograph shoots before the release of "All Hope Is Gone"; in the music video for "Psychosocial" they are seen burning them.Shortly after its inception, Slipknot's masks were homemade, but since 2000 they have been custom-made by special effect artist and musician Screaming Mad George.The band's image has been the subject of much criticism and controversy, with critics generally accusing it of being a sales gimmick.