One of my favorite days of the year with my 7th graders is the day we start learning about contour. We spend the whole period practicing Continuous Line Contour, which is just drawing without lifting your pencil up. It's a totally different drawing experience and can be challenging because there is no erasing or fixing mistakes and everything is connected. I have them start by drawing something with their eyes closed and then have them draw the same thing with their eyes open- all without lifting their pencils off the paper. I always love the results and the kids have a lot fun laughing at their own and each others drawings.