When a woman gives birth her waters break and she pours out the child and the child runs free.

Thinking about time is to acknowledge two contradictory certainties: that our outward lives are governed by the seasons and the clock; that our inward lives are governed by something much less regular-an imaginative impulse cutting through the dictates of daily time, and leaving us free to ignore the boundaries of here and now and pass like lightning along the coil of pure time, that is, the circle of the universe and whatever it does or does not contain.

Do you wake up as I do, having forgotten what it is that hurts or where, until you move? There is a second of consciousness that is clean again. A second that is you, without memory or experience, the animal warm and waking into a brand new world. There is the sun dissolving the dark, and light as clear as music, filling the room where you sleep and the other rooms behind your eyes.

Earth is ancient now, but all knowledge is stored up in her. She keeps a record of everything that has happened since time began. Of time before time, she says little, and in a language that no one has yet understood. Through time, her secret codes have gradually been broken. Her mud and lava is a message from the past. Of time to come, she says much, but who listens?

Freud, one of the grand masters of narrative, knew that the past is not fixed in the way that linear time suggests. We can return. We can pick up what we dropped. We can mend what others broke. We can talk with the dead.

The Hopi, an Indian tribe, have a language as sophisticated as ours, but no tenses for past, present and future. The division does not exist. What does this say about time? Matter, that thing the most solid and the well-known, which you are holding in your hands and which makes up your body, is now known to be mostly empty space. Empty space and points of light. What does this say about the reality of the world?

There are times when it will go so wrong that you will barely be alive, and times when you realise that being barely alive, on your own terms, is better than living a bloated half-life on someone else's terms.