A hands-on moire pattern generator: two layers of lines, dots, circles, or radial spokes overlap on the same canvas, and their interference creates large shifting fringe patterns out of nothing but simple repeating shapes. Drag either layer to move it, dial in rotation, spacing, and scale, and watch the fringes swim, bloom, and collapse in real time, the same effect behind screen-door shimmer, fabric moire, and the fine-line patterns printed on banknotes to foil photocopiers. Switch to the colorful palette for a print-misregistration look, turn on auto-drift to let the two layers slowly wander on their own, or randomize for a surprise starting point. Save any frame you land on or share it as a piece of optical art. For anyone searching for a moire pattern generator, an optical illusion maker, or a visual interference simulator.
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