STOP IT!

This, to me, is perhaps the oddest thing I've posted here. The collaged mascot characters are from the cover of a sketchbook, but I can't remember which manufacturer's mascot he is...Speedball and Grumbacher are the two most likely suspects, but I can't find evidence of the source off hand. I have no idea what they're arguing about, either.

Huh?

There seems to have been a lot of thought put into this...chart(?), but what it all means is opaque to me. Some might scoff at the mathematical equation at the bottom... but did you stop to think that perhaps I was working with roman numerals? Anyway, that's my story and I'm sticking to it.