The "Brotherhood of Light" were a group of multimedia and light technicians in the 1960's and 70's that were responsible for the innovative, interactive oil based lightshows used by artists such as "The Who", Jimi Hendrix, "The Doors" and Santana.
In 1968 they began a venture to create a chair that could be used to produce a personal light show for use in the home. The chair was called "Sit Down, Tune In, Drop Out". They began by making a series of makeshift prototypes used to test user reaction and get some early feedback. In 1969 they took the "mark five" to Woodstock as a side exhibit to which it receive high praise from patrons and from the likes of Jimi Henrdix.
Several more versions were made and the concept refined, but even though people enjoyed using the chair immensely, there wasn't enough proof that putting the chair into production would turn a profit as most people were unwilling to pay the price that the production build would cost and as a result it never went into production.
"The world is a crystal"
A Short interview with Brotherhood of Light UK member Hubert Maxwell about the "Sit Down, Tune In, Drop Out" chair filmed in 1972 for the late night magazine show "The Friday Show