Video Clip Peter Ralston Interview Episode 21: Is a rock sentient? Posted January 31, 2017 Peter Ralston [vimeo 181959482 w=640 h=480] Is a rock sentient? (21 of 29) from Peter Ralston on Vimeo. Peter Ralston talks about sentience. Find out more at PeterRalston.com. Join the discussion on Facebook with Conscious Dialogues.