A wonderful book about the development of perception and understanding.

Removed from BookCrossing Circulation: This book was part of my BX "Permanent Collection," with its BCID lightly written in pencil on the title page. While reducing our numbers of books at home, I selected this one for donation to Friends of the Library for their book sale. Since the book is no longer available "for adoption" via BookCrossing, I've erased the BCID. Another book freed to find its next reader!