Hopi folktale in which a hummingbird fashioned from a sunflower stalk comes to life and helps two starving children who were left behind in their village when the adults went to search for food.

The earliest rock art - in the Americas as elsewhere - is geometric or abstract. Until now, however, no book-length study has been devoted to the deep antiquity and amazing range of geometrics and the fascinating questions that arise from their ubiquity and variety. Why did they precede representational marks? What is known about their origins and functions? Why and how did humans begin to make marks, and what does this practice tell us about the...