Pulfrich phenomenon
n. An optical illusion in which a pendulum swinging perpendicular to the line of sight appears to be moving in an ellipse if one eye is covered with a dark lens and the subject stares at the center of the pendulum's swing.
n. An optical illusion in which a pendulum swinging perpendicular to the line of sight appears to be moving in an ellipse if one eye is covered with a dark lens and the subject stares at the center of the pendulum's swing.
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