A new trailer for Jodorowsky’s Dune screened at last year’s Toronto Interntional Film Festival hit the web, Collider reported.

According to Collider, the documentary goes behind the scenes of Alejandro Jodorowsky’s astoundingly ambitious adaptation of the Frank Herbert sci-fi novel Dune.

“Frank Pavich’s documentary is a celebration of imagination and enthusiasm, and Jodorowsky’s adaptation is made except for the movie part. It’s also fascinating to see how it served as an inspiration to other filmmakers even though it was never filmed and the technology of the time probably couldn’t have brought his vision to life anyway. But for Jodorowsky, the technical, financial, and even traditional limitations (like runtime) were an afterthought, and one of the reasons the movie is so great is because it wraps us up in his excitement for the unmade feature,” Collider said.

Jodorowsky’s Dune opens March 21st.