Freedom, for him, lay at the heart of all human experience, and this set humans apart from all other kinds of object. Other things merely sit in place, waiting to be pushed or pulled around. Even non-human animals mostly follow the instincts and behaviours that characterise their species, Sartre believed. But as a human being, I have no predefined nature at all. I create that nature through what I choose to do. Of course I may be influenced by my biology, or by aspects of my culture and personal background, but none of this adds up to a complete blueprint for producing me. I am always one step ahead of myself, making myself up as I go along. Sartre