Use Black and White balls with any of Kodo's ramp sets, your own gutters, cardboard tubes, and pipes. When used with ramps, the two distinct colors provide children with a physical cue to more easily identify the relationship between rotation and speed. They naturally support visual discrimination. Their interesting texture makes them appealing in your sensory area. Use them for supporting many math concepts as well. Offer them with a variety of ball types to encourage children to sort, order, pattern, classify, and count.