It does not know if there are other spots or if they are black or white. There is no degree or compromise in the existence of that spot. It is either white or black, yes or no. The spot does not know if it is a bit of shading on the hood of the car, a piece of cloud in the sky, or a part of a line on the driveway. As we look at such a photograph and think we are looking at the unity of a scene from life, that unity of experience in sight is only an illusion because that image of an abundance of objects in a photograph showing us the world is really just an arrangement of dots.
Many small things give the impression of being one bigger thing.
Now think of the nerve cells in the eye. We don't experience light but we can experience the evidence of it. The light is not felt by the light-sensitive cell. The light-sensitive cell feels the experience of it's own firing. None of these cells reacting to light has any awareness of the nature of the firings of any of the other cells on the retina.