I have always been fascinated by the life cycle, the way skin metamorphoses over time. I am mesmerized by skin and that's why I've been attracted to the nude. I do think people show their soul when they are stripped down psychically. There is something wondrous that happens when we relate on that level - and I am interested in that depth.

My early self-portraits appeared effortlessly and seemed like equivalents for my deeper emotions. Many critics remarked that the images had an almost other-worldly haunting presence. For me, they were simply my own reality at that point in my life. What I was trying to reveal was my inner soul in all its fragile complexity. Without knowing it, I was trying to peel back the layers that shroud and bind us all as we struggle to reveal our own authentic selves.

I want to allow others to reveal and celebrate aspects of themselves that are usually hidden. My camera is a witness. It holds a light up for my subjects to help them feel their own essence, and gives them the courage to collaborate in the recording of these revelations.

I try to neutralize my figures; I want them to be mythic and timeless. I want them to exist beyond time. I've used the skull caps or cowls to banish hair, which is distracting. I want to isolate the face and concentrate on what is really going on deep within my subjects.

Over the years I have photographed thousands of people. I have never stopped being curious and trying to discover new worlds. I have used my camera as a mirror for my subjects as well. I remember photographing a woman in her 80s for my book, Wise Women, who told me it had been a long time since anyone had really been interested in "seeing" or photographing her. When she saw the picture, she burst into tears. She saw something in the photograph, an inner beauty and soul, she felt had long ago vanished.

Our best pictures happen by grace.

The most important thing is to try and enjoy life because you never know when it will be gone. If you wake up in the morning and have a choice between doing the laundry and taking a walk in the park, go for the walk. You'd hate to die and realize you had spent your last day doing the laundry.