This thesis discusses my video art practice in relation to the philosophers Henri Bergson and Gilles Deleuze. Bergson and Deleuze have written extensively on time, consciousness, matter, and the universe, holding that the only constant is change. What I find useful from the two philosophers is their shared attempt to give materialist and immanent (not transcendent) accounts of time, change, movement and representation. In my video art, I have been producing a kind of extended portraiture that introduces time and change into what I think is usually a static form. The works of Bergson, Deleuze and other philosophers/cultural theorists who write about their work have helped me to develop and discuss what I see to be a different approach to por...