I'm sorry that I used thiss paper, but I drawed it at school and I haven't had an other /:
I started to draw in the math lesson ^^
Usually grid paper makes a good background when drawing
Nice job ^^
I liked the detail of the PI symbol number which comes from the infinite spiral you know the PI number is infinite and irrational
I think, you got portraying an abstract idea very well in an image; concrete and fantastic. My congratulations on the original theme you are very intelligent !!!