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The human eye is not a camera. It does not simply record everything in front of it and send a perfect copy to the brain. Instead, seeing is an active process. The brain receives information from the eyes and attempts to make sense of it. Most of the time, this works remarkably well. But when information is incomplete, distant, unusual or ambiguous, the brain has to make assumptions. That is extremely important when investigating UFO reports. A witness can be completely sincere and still be mistaken about what they saw. This is one of the most difficult ideas for people to accept. We tend to believe our own eyes. If we see something clearly, we naturally assume that our interpretation must be correct. But seeing an object and identifying an object are two different things. A person can accurately report that they saw a bright light without being able to determine whether that light was a planet, aircraft, satellite, balloon or something else. The problem becomes even greater at night. A bright point of light against a dark sky provides very little information about distance. Without a reference point, judging size and speed can be extremely difficult. A small object nearby may appear enormous. A large object at high altitude may appear tiny. An object moving slowly at a great distance may appear to move rapidly. The brain has to estimate all of this from limited information. One important phenomenon is pareidolia. Pareidolia is the tendency to perceive meaningful patterns in ambiguous or random information. People see faces in clouds. They see shapes in rock formations. They see familiar objects in shadows. The brain is constantly searching for patterns because pattern recognition is extremely useful. Our ancestors depended upon it. Seeing a possible predator in the grass could mean the difference between survival and danger. It was safer to react to a possible threat than to ignore one. That instinct remains part of the human brain. The problem is that the modern sky contains many things that can trigger the same response. A distant light moves slightly. The brain searches for an explanation. If the person already believes UFOs are real, an extraterrestrial craft may become one possible interpretation. If the person is familiar with aircraft, they may think it is a plane. If they are familiar with drones, they may suspect a drone. The object has not changed. The interpretation has. Culture therefore plays an important role in perception. During the 1950s, people were surrounded by images of flying saucers. They appeared in newspapers. They appeared in films. They appeared in magazines. The saucer had become a familiar cultural symbol. A strange object in the sky could therefore be interpreted through that cultural framework. Today, the same process can happen with drones or other modern technology. The human brain is still doing what it has always done. It is trying to identify something unfamiliar. Another important phenomenon is the autokinetic effect. A stationary point of light viewed against a dark, featureless background can appear to move. This can happen because the eyes make tiny involuntary movements, while the brain has no fixed reference point against which to judge the light's position. A person staring at a bright star or planet may therefore perceive movement that is not actually occurring. This has been particularly relevant to UFO investigations. Venus, for example, is extremely bright and has frequently been reported as a UFO. Under certain conditions, it can appear remarkably unusual. A witness who sees a bright object apparently moving in the night sky may have no reason to suspect that