There are several qualities to look for in judging a kaleidoscope image. The most obvious is the symmetry of the image if it is intended to be symmetrical. There should be no broken images along the lines or segments of the image where the mirrors reflect. Secondly, there is the cleanliness or sharpness of the image. Mirrors can chip along their seam and create spots in the image that are not pleasant. The mirrors should be dust-free. Most mirrors are sealed at both ends but some are not. Accumulating dust will continue to blur the image. The choice of objects for the interior image should not be too few creating a sparse image or too many creating a crowded image.