• Our perceptions are fallible. We sometimes see what isn't there. We are prey to optical illusions. Occasionally we hallucinate. We are error-prone.

    Carl Sagan: Our perceptions are fallible. We sometimes see what isn't there. We are prey to optical illusions. Occasionally we hallucinate. We are error-prone.
    Carl Sagan (2011). “Demon-Haunted World: Science as a Candle in the Dark”, p.43, Ballantine Books