1940s or 50s scientific film on psychology of perception, phi phenomenon, flicker fusion, illusions

From an incomplete film reel. Date unknown. Silent. Spooky. I failed the test at the end.
1940s or 50s scientific film on psychology of perception, phi phenomenon, flicker fusion, illusions
1940s or 50s scientific film on psychology of perception, phi phenomenon, flicker fusion, illusions
1940s or 50s scientific film on psychology of perception, phi phenomenon, flicker fusion, illusions

illusions