It started simply enough in 1999. Jeff Harris, a photographer based in Toronto, took his first self-portrait, something he has since repeated every day. His visual diary now amounts to 4,748 photos and they tell a very personal story. They show the passing of time, some fairly normal moments, but also some difficult ones. In November 2008, Harris was diagnosed with cancer, and his experience with it — his surgery, radiation treatment, eventual paralysis in one leg — all gets visually documented by his project. The video above, originally appearing on TIME’s web site, takes you inside Harris’ project. The clip runs 5 minutes.