A Rainbow of Circles

Whoopee! Got approval from the principal to do one of my wild and crazy ideas: to give the kids an experience of how to make a circle, each one gets measured with a piece of string, then we go outside and take turns holding one end of the string in the center and having the child trace the circle her height makes with playground chalk. Eventually we'll get almost three hundred concentric circles...

Source: https://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Burgess_model1.svg/2000px-Burgess_model1.svg.png