Living chalk?

The Rithmatist - Brandon Sanderson

I finished The Rithmatist by Brandon Sanderson tonight.
I thought this book was good,not just good but really good.Yes it is a YA,that being said,there was no sex scenes which I'm fine with.
I thought the character development was good as well as the creativity of the steampunkish world.
But the magic system is the most different I've ever seen.It's basically like a wizard with an enhanced piece of chalk drawing symbols
on the ground.
It was all very new to me,but so interesting.And it takes place the majority of the time in a school.