Many good comments here already, but one thing to note is that 16-18 fps is *so slow* that it looks like a bunch of still images flashed on screen “very fast”. Projectionists eventually worked out that 24 fps with each frame shown twice at 48 fps is basically the minimum that viewers will perceive as “smooth”. Anything less than that looks like a fast slide show, which is part of the reason it *feels* fast. It’s like a bunch of 1-frame fast cuts instead of constant, smooth, “slow” motion.
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