Early in "The Beatles: Get Back,” Peter Jackson’s nearly eight-hour documentary on Disney+ about the making of the album "Let It Be,” the band forms a tight circle in the corner of a movie soundstage. Inexplicably, Yoko Ono is there.

She perches in reach of John Lennon, her bemused face oriented toward him like a plant growing to the light. When Paul McCartney starts to play "I’ve Got a Feeling,” Ono is there, stitching a furry object in her lap. When the band starts into "Don’t Let Me Down,” Ono is there, reading a newspaper. Lennon slips behind the piano, and Ono is there, her head hovering above his shoulder. Later, when the group squeezes into a recording booth, Ono is there, wedged between Lennon and Ringo Starr, wordlessly unwrapping a piece of chewing gum and working it between Lennon’s fingers. When George Harrison walks off, briefly quitting the band, there is Ono, wailing inchoately into his microphone.

At first I found Ono’s omnipresence in the documentary bizarre, even unnerving. The vast set only emphasizes the ludicrousness of her proximity. Why is she there? I pleaded with my television set.