Lumia are an art form that permits visual artists to play images in the way that musicians play with sounds. Though the idea of creating lumia has a long historical tradition, modern graphicallybased computers make it possible to design instruments for creating lumia that are more flexible and easier to play than at any previous time in the history of art. In designing and playing lumia, three principal dimensions require attention: color, form, and motion. By organizing the design of lumia and instruments for creating them along these dimensions, it is possible to learn a great deal from art theory and history, as guidelines have been devised for the effective use of each of these dimensions.