I think what you’re describing is different than the slow motion fall. (Though it may be the same, or similar type of processing….) The fan, I believe is simil

I think what you’re describing is different than the slow motion fall. (Though it may be the same, or similar type of processing….) The fan, I believe is similar to a clock ticking and a type of saccadic masking. (1) Related to the optokinetic response. (2) I’m sure someone with much more knowledge than I could better clarify however. (1)https://en.wikipedia.org/wiki/Saccadic_masking https://en.wikipedia.org/wiki/Saccadic_masking (2) https://en.wikipedia.org/wiki/Optokinetic_response https://en.wikipedia.org/wiki/Optokinetic_response