Blind Illusion is an American progressive thrash metal band from Richmond, California. Formed in 1978 by lead guitarist and main songwriter Mark Biedermann, the band has had several lineup changes, with Biedermann being the only constant member. Blind Illusion is also notable for featuring future Primus members Les Claypool and Larry LaLonde, who performed bass and guitar respectively on their 1988 debut album The Sane Asylum. After a 20-year hiatus, Biedermann reformed Blind Illusion in 2009. A new EP entitled 2018 was released in February 2019 and includes remakes of some of their older songs.