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Content: In the double slit experiment, the observer has an effect by knowing which slit an electron or photon passes through. In Bishop Berkley’s tree falling in the forest, the sound is only present if there is a human ear to hear it. In Schrodinger’s Cat, the state of the cat is undetermined until the box is opened and a person looks inside. When does the eye observe? At the retina? In the optic nerve? In the occipital cortex? Frontal cortex? The soul? To think about how the observer is vaguely or incorrectly specified, we should ask ourselves, “When  precisely does the observation actually occur?”