As an animator, the client simultaneously knows everything about what makes a good animation, colour theory etc. and is utterly incapable of doing it themselves or providing any specific feedback beyond "I don't like this" or "make it feel more pink but don't actually make it pink."
This state persists until you introduce an invoice for all the extra work it'll take to redo all the stuff they agreed to two weeks ago, and then the waveform collapses and suddenly everything you sent them in the first place is fine.