[Frameworks] books on animation theory?

[Francisco Torres]

when i was in film school it used to bother me that in most film
theory books animation was not even mentioned, as if it did not exist
or as if it was not part of cinema at all. then i thought that all of
cinema is animation, the camera breaks down the image into frames,
then the projector screens it giving the illusion of continuity. so
all film theory is abour animation.