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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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OPTICAL ILLUSION xx OPTICS Optical illusions of low-angle celestial observing. A look at the causes and results. Optical illusions. Four easy-to-do demonstrations. The floating finger trick, the shrinking edge effect, the pendulum phenomenon, and the reversible cube concept. Visual principles explained. Make a black and white disk that shows colors when you spin it. Experience the Fechner phenomenon. A spinning black-and-white disk will cause the human eye to see the colors red, blue, and green. Movie wheel toy. A cardboard disk with slots around the perimeter is spun and used to demonstrate the principles behind moving pictures. Kube quilt wall hanging is a study in optical illusion. Experiment that illustrates the principle by which black and white television can produce the optical illusion of color pictures. Three-dimensional variation of the reversing-cube illusion. Several experiments for generating visual illusions. (1) The illusion of fuzzy spots, (2) the illusion of color, (3) the illusion of motion or its reverse, that a moving object is standing still. Includes instructions for constructing an apparatus demonstrating flicker fusion and an apparatus demonstrating the phi phenomenon. How to make a consecutive cube with a missing corner that creates an optical illusion of replacing the corner with a smaller cube. Pattern for construction from cardboard included. A look at Mussatti effects and examples of six disk designs that will generate three-dimensional illusions. Visual illusions that can be achieved by putting a dark filter over one eye. Includes circuitry and instructions for building an apparatus for measuring visual latency. Visual illusions in random-dot patterns and television "snow". Part 1. Experiments with the tendancy of human perception to impose order on disorder. Visual illusions in random-dot patterns and television "snow". Part 2. Visual illusions in random-dot patterns and television "snow". Part 3. Includes computer programs to generate random-dot displays. The amateur scientist. All about phosphenes, those luminous patterns that appear when the eyes are closed and pressed with your fingers. How to observe visual artifacts (also known as "floaters" or entoptic phenomena) that result from blood cells in front of the retina. The amateur scientist. How to stop a spinning object and perceive curious "blue arcs" around a light by humming. How movements of the eye caused by humming can "freeze" a moving pattern. The amateur scientist. Bidwell's ghost and other phenomena associated with the positive afterimage. Experiments to investigate afterimages caused by subjecting the human eye to a bright flash in a darkened room. Methods and optics of perceiving color in black-and-white grating. Concerning disappearances, including the Cheshire cat's odd vanishing act. Experiments with visual "selective erasure". Both the "Cheshire-cat effect" and the "rhino-optical effect" are studied. An explanation of subjective-contour illusions, those bright spots that are not really there. Some entertaining lessons in optics that may make air travel easier to endure. Experiments and observations for an airline passenger seated next to a window. Shock-front phenomena and other optical oddities to entertain a bored airline passenger. Experiments and observations for an airline passenger seated next to a window. The cafe-wall illusion, in which rows of black-and-white tiles appear to tilt and horizontal lines appear to converge. Neon-spreading illusion. A study of the optical illusory spreading of color resembling the diffuse light that issues from a glowing neon tube. Computer simulation of the "mountain shadows" phenomenon. This optical illusion is caused by the shadow of a mountain being cast onto the haze in the atmosphere, forming a symmetric cone with fairly sharp edges. Includes a computer program written in BASIC. Marquetry mirages. Small wooden boxes are covered with carefully selected veneers and finished using a unique shading process to produce an optical illusion when you look at the box. | |||||||||
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