Three existences in one line. A fetus, a woman and an old lady form a single entity.
Choose a point in time to start. Walk up thread of life by choosing the past or the future. Your past or the future of those who will come. Your future or the past of someone who has already come. The thread is unique. The cycle of life repeats itself. The perspective changes and the starting point is a forced choice within a circle without beginning or end.