Coloring With Markers? Huh?

We recently gave Vivian some markers to explore. She's not bad on paper but she is better on her body. Not only is it fun to color herself but she I think she finds it more entertaining to put the cap on and take it off. She concentrates really hard and she can stay focused on the task for a good 10 minutes. Luckily the markers are washable and come off very easily with a wipey.