More than 200 professional and amateur artists have spent hours on their hands and knees over the course of two days to create their artworks for the.festival. /CFP Photo

Their efforts have transformed Denver's streets into a bright and colorful art gallery, adorned in vivid pastel chalks. /CFP Photo

The festival has its roots in 16th century Italy, when artists took to town squares to create temporary chalk masterpieces. /CFP Photo