http://kleas.typepad.com/kleas/2012/02/something-new-at-the-preschool.html

http://www.theiowafarmerswife.com/2012/06/outside-play-link-up-chalk-dress-up.html

Através de Juff Bonny 

http://playfullearning.net/2008/08/everybody-needs-a-rock-classifying-sorting/