A few years back, people around the country were being arrested or fined for using chalk on sidewalks. I saw a local chalk art competition, where the participants were forced to do their artwork on sheets of paper taped to the sidewalk. http://www.motherjones.com/politics/2012/08/war-chalk-arrests/
Thant is one of the most ridiculous things I've ever heard!! It washes away! Thanks for commenting. :)