First, “make a little hole in your mouth,” suggests Leah in her book How to Whistle. Leah’s book is one of more than 100 how-to books created by and for preschoolers in early-care programs throughout Rhode Island. All of the books will be on display in January 2012 at the Providence Children’s Museum, starting with an opening night celebration on January 20. The 22 participating teachers are taking a seminar on observing and documenting children’s learning as part of a collaboration between Ready to Learn Providence and Making Learning Visible, a program out of Harvard University.