Blind Illusion is an American progressive thrash metal band from Richmond, California. Formed in 1979 by lead guitarist and main songwriter Marc Biedermann, the band had an extremely unstable lineup (Biedermann being the only constant member) and went through several stylistic changes during their time. After a 20-year hiatus, Biedermann reformed Blind Illusion in 2009 and released the band's 2nd album, Demon Master. As of June 2014 they are working on new material.