These are the original slides used on the live 'Lamb Lies Down On Broadway' tour of 1974-1975. The album tells the surreal story of a half Puerto Rican juvenile named Rael living in New York City, who is swept underground to face bizarre creatures and nightmarish dangers in order to rescue his brother John. This would be Peter Gabriel's final tour with the band.
The Genesis tribute band 'The Musical Box' helped recreate the slide show and are currently using it on their tour of the Lamb in 2011/12.