Found here a great example of how to paint the wall.
Acrilic and pen
Size: about de 7 x 3 meters
had a research trip to find out more about app for tablets.
Found Zen Brush iPad app
Interesting how it would be explained today…
Cool Math 4 Kids describes itself as "an amusement park of math and more". It's full of fun games and lessons.
This site has a ton of interesting problems to work on, ranked by difficulty. This was where Project Euler got its start, before it moved to a separate site.
"Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems."
From the site: "The Euler Archive is an online resource for Leonhard Euler's original works and modern Euler scholarship. This dynamic library and database provides summaries of and access to digitized versions of original publications, and references to available translations and current research."