Why do photos always look at me?

The tasks in the photos and pictures are actually flat. The irradiation range of flashlight depends on the distance between bulb and lampshade and the shape of lampshade. Then the "light bulb" and "lampshade" of the eyes in a flat picture are on the same plane, so its irradiation range is 180 degrees. In other words, if you embed a point light source into a wall, its irradiation range is everywhere outside the wall. In this case, if we compare the observation range of human eyes, if the other person's eyes are all on the picture instead of the bust, the effect will be more obvious. Coupled with the stereoscopic effect and psychological suggestion of the picture, we will feel that the other person is looking at ourselves, whether it is an adult or a child, and we will know that it is suitable for everyone after the following experience. I don't know if the answer is clear.