This is a video showing multiple interactions between cats while putting emphasis on small behaviors that can easily be missed if one is not attentive.
I am very much hoping to be seeing new research in the coming years about this type of communication because I am always a bit annoyed when I read things that say that cats lack true conflict defusing signals. I hope that this video shows that that is not the case.

The book I mention in the video is:

On Talking Terms with Dogs: Calming Signals by Turid Rugaas