I used to love making flipbooks in the late-70’s/early-80’s. Movie equipment & film stock was so expensive it was out of the question, so flipbooks were actually the cheapest way to make cartoons. Mine were usually done with close to a hundred hand-drawn 1.5 inch square images stacked on 3 inch card stock, then wrapped in tape on the side they’re supposed to be held. I called this one GREY BRAINS.