Our brain is constantly interpreting what we see and literally editing things out. We know that very directly, because people say, aren't you listening? And of course, your ears were taking in the sound, but your brain decided to just kind of not take it in. The difference n bill and pill is the amount of time that it takes between the onset of the the movement of the mouth and then theaa vocalization. It's a 30 a second timing difference. Even though the motions that you're making are the same, there is a very, very clear acoustic difference.