In part, this is because lines for 10U play are generally a different color from the existing lines and are unobtrusive and within the same color family of the 78-foot court surface, for instance, light blue 10U lines on a dark blue court surface. (If adding 10U lines to a 78-foot court, the lines should never be white, or any color, such as gray, that might be mistaken for white.) We have stripe