Symbiopsychotaxiplasm: Take One is a 1971 American experimental documentary film written, directed, co-produced and edited by filmmaker and documentarian William Greaves.

[1] The film is shot and presented in the style of a cinéma vérité documentary, attempting to capture and examine pure reality unhindered by the presence of the cameras all around.

In 2015, Symbiopsychotaxiplasm was selected by the United States Library of Congress for preservation in the National Film Registry, deeming it "culturally, historically, or aesthetically significant.

"[2][3][4] Greaves's original concept for the film was to apply Heisenberg's uncertainty principle to a project that he had conceived several years earlier, in which he would follow and document a group of actors undergoing the audition process for an acting job.

The concept of symbiotaxiplasm (from roots meaning "together-life-movement-fluid") originated from Arthur F. Bentley in his book Inquiry Into Inquiries: Essays in Social Theory, which Greaves described as "those events that transpire in the course of anyone's life that have an impact on the consciousness and the psyche of the average human being, and how that human being also controls or effects changes or has an impact on the environment."

Greaves appears as the director of the fictional documentary Over the Cliff and utilizes the three film crews to each cover a different aspect of the story.

Greaves's attempt to capture reality on film employs cameras in the right places at inopportune moments to discourage any short improvisations or unnatural events.

Its experimental nature and bizarre content made finding distribution through channels virtually impossible.

"[11] Steven Soderbergh, a longtime proponent of the film, reflected: As you can imagine, I just thought it was one of the most amazing things I'd ever seen.

Here, you're just watching a situation where people are absolutely convinced that Bill is out of control, doesn't know what he's doing, and you're a fly on the wall.