The smallest gap visible is limited by the smallest dot of ink the printer can produce, making the Siemens star a useful tool for comparing two printers' resolutions ( DPI). When printed or displayed on a device with limited resolution, however, the spokes touch at some distance from the center. In concept, the spokes only meet at the exact center of the star – the spokes, and the gaps between them, become narrower the closer to the center one looks, but they never touch except at the center. It consists of a pattern of bright "spokes" on a dark background that radiate from a common center and become wider as they get further from it.
A Siemens star, or spoke target, is a device used to test the resolution of optical instruments, printers, and displays.
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