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Appl."],"published-print":{"date-parts":[[2026,3,31]]},"abstract":"<jats:p>A Flying Light Speck (FLS) is a small drone configured with light sources to illuminate different colors and textures. A swarm of FLSs illuminates complex 3D multimedia shapes in a fixed volume, a 3D display. An FLS is a mechanical device. Its failure is the norm rather than an exception, causing a point of an illumination to go dark. In this article, we use reliability groups with dark standby FLSs to minimize the duration of time a point remains dark. We introduce three techniques to prevent a dark standby FLS from obstructing the user\u2019s Field of View (FoV). All three move the FLS out of the user\u2019s FoV. 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