It may just be pure imagination. Sometimes we think there s dust or a flying spider s web in our faces and there s nothing there at all. The sensory nerves in the skin are just sending us a false alarm message. It happens to most people from time to time. It s always possible, of course, that people who are psychic can feel a friendly touch from an invisible psychic presence.
Some mediums believe they can see ghosts.
Others think they can hear them. Some people are aware of them through the sense of touch or smell.