Vision
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For a human to mentally see something in its environment, the object must first have a light source. The light can either be produced by the object or reflected from it. A clear example would be the Sun and the moon. From a process called Nuclear Fusion the Sun is able to produce visible light. This light then travels through the vacuum of space and eventually reaches Earth in about eight minutes. The Sun is easily visible to the naked eye because of the vast amount of energy released through this process. Light does not have to be created directly from the object you are viewing. Light can also be reflected off an object. Such as the moon, the moon does not have its own energy source to produce visible light. When you look at the moon, it is actually the Sun's light being reflected off its surface...