It lasts only a fraction of a second. Then comes the next one, then the next one, then the next one and so one, in an endless row.
We have no time to see them clearly, we see only a glimpse of their existence.
That fraction of a time is long enough to form a whole story which is a reflection of the outside world. There is no limit, what we can see and imagine. It is a message from the world which we do not see although it lies in front of us. How real is the world in which we live?