Seen at the 2015 Denver Chalk Art Festival, it’s another impressive piece of work by Dawn Wagner:

If you hadn’t noticed, this work is done in a form of forced perspective.  Notice the gray outlines (partially cropped out)?  Those are duct tape lines forming a rectangle on the Larimer Street pavement — the art work was chalked in order to look “correct” when seen from just one vantage point at its base.