With the increased use of ethnic and fusion-like elements such as sitar, tablas and flute, the Swiss quartet Krokodil expanded their West Coast and blues rock roots with additional musical expressions. For the recordings of their third album An Invisible World Revealed in 1971/72, they added a Mellotron, which was available in the studio of producer Dieter Dierks. He is also regarded as the fifth member of the band, as he played a major part in this change of direction by encouraging the band to try out new sounds and ideas and even occasionally contributing of the electric piano.

By this time, the band had reached a level of virtuosity that quickly made this album, released in Germany by United Artists Records, a milestone of early 1970s prog rock. Attractively designed by drummer and graphic artist Düde Dürst, who was also responsible for the cover design of the debut album, it has since been held in highest regard by collectors from all over the world.