Drawn

"Graffiti means making marks on surfaces using just about anything, be it markers, spray,  paint,  chalk,  lipstick,  varnish, ink.

Or it can be the result of scratches and incisions.  The aim is to maintain the energy created by disturbance or excitement in the street." 

Barry McGee http://www.brainyquote.com/quotes/keywords/chalk.html#TDPPDcbUubMLZq53.99

Chalk drawings are all around the streets of any urban environment. People need to see them, noticed them, love them, embrace them. 
People need to create them, fill their world with them. Go and buy some chalk today, pick a bit of tarmac and DRAW!