The image is actually black and white. Only thin colored lines are added by the artist. Your brain blends those tiny color cues with the grayscale beneath and assumes the rest of the scene has the same colors. This happens because the visual system averages nearby information instead of processing every pixel separately. As a result, your perception fills in skin tones, skies, and objects even though no real color exists outside the lines. Want more interesting content like this ? Follow gravitonomy :) Via: Chuwa (Francis), “Railway people” No copyright infringement intended. Kindly DM for Removal. #science #opticalillusion #illusion #physics #rgb