One of the things I thought was really cool was this work by Bruno Munari:
It was meant to show how little we really needed to portray a face and it reminded me a lot of non-human cartoon characters that have weird forms but we can still tell where the face is and the emotions its showing.
The other thing I found interesting was the project Artifacial: https://artifacial.org/
It think its pretty weird to have an externally controlled face, and I have no idea what the uses would be, but it was cool to see the control they had on each different muscle in the face using the nodes. It must be really weird to be the guy getting his face shifted.