Twirl and Whirl will have you breaking white light into its color components and mixing those spectrum colors into white light. Includes a small, spiral top, larger laser-etched top and 15cm (6 in) cardboard circle to make yet another top. You'll find paper in each of the primary color blends, magenta, cyan and yellow, and patterns for a spectrum wheel and Benham's Disk. Six-page booklet includes full instructions, explanations and experiment suggestions. Class sets include 20 free pointed, round craft sticks and center guide. TWIRL AND WHIRL Kit.................$275 ea.