“They rejected subjectivism, expressiveness, narrative, and direct social reference and focused instead on the medium’s formal and material properties … flicker films were about retinal response to rapidly changing frames … structural film also inquired into the spectator’s perceptual activity … flicker and single-frame films engaged the psycho-physics of vision.”
“Structural Film: Noise”, Juan A. Suárez, in Still Moving: Between Cinema and Photography.