I can't really explain my fascination with using different colors to teach, but I'd like to think it makes learning math a bit more meaningful especially for visual learners. /u/tostada has supplied me with a healthy supply of assorted white board markers, enough to last me the year! As much as I am obsessed with white board markers, I can't find it in myself to spend the money in purchasing them. THANK YOU /u/tostada!!