masks, puppetry, clown, Etc.
A relationship that I have found recently is in the physical fitness that you need for both styles of performance. You need to be in good physical shape and be aware of what your body is doing at all times for both styles of performance. Another area of research that I am investigating is the use of mask and puppet from the late 1800's on as a way to bring spirituality back into theatre. There is something inherently spiritual about an object, something that has no life, being brought to life. It is supernatural or mystical to us.
I agree with you Seth that there is a magical element in giving life to an object. Thinking about what Preston said about the bonobos behaving with a mask and a doll, it might be that the diference is in giving life to an object with a puppet and personifying a character with a mask. I supose that for the bonobos, the mask wearer was more alive than the doll, the doll was still an object they didn't give life to. The puppeteer gives life to an object and an actor personifies a character with a mask.