Hi Josh: The lecture notes for the COOL lecture are in: http://www.ccs.neu.edu/research/demeter/course/f97/lectures/powerpoint lec6.ppt.zip lec6.ppt http://www.ccs.neu.edu/research/demeter/course/f97/lectures/postscript lec6-color-2-per-page.ps.zip lec6-color-2-per-page.ps Does Crista's description conform tou your implementation? I have adapted the syntax. Please can you check it. -- Karl