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Last edited Apr 27, 2023

Created on Apr 22, 2023

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This visualization creates a circular aperture effect on a full-screen grid of horizontal and vertical black bars. Using D3 selections and data joins, the code generates 30 horizontal and 80 vertical rectangular strips, then applies two SVG masks with white and black circles at the center to selectively reveal or hide intersections. The result resembles a moiré pattern or camera viewfinder, where overlapping bars form a circular optical illusion against the white background. The implementation uses D3’s `select`, `data`, and `enter` APIs along with SVG mask elements to achieve the layered visual effect.

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A bare minimum HTML page demonstrating use of CSS and JavaScript.

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