performance document

This is document of one to one performance I've done. I asked audience to listen to each other's heart beat. The simple tool was blocking any other noise of environment and after a while it was confusing as we were both feeling we're listening to our own heart beat and not the other person's.
I was going to wear same colour as the tool and also put a drink (in same colour such as cafe) and have mirrors as prop but I changed my mind.