Three children, Tom, Hannah, and Shadowchild, who represents the reader, are made to guess, using the concept of binary logic, the color of the hats on their heads. An introduction to logical thinking and mathematical problem-solving.
- ISBN10 0613376986
- ISBN13 9780613376983
- Publish Date November 2001 (first published 5 April 1985)
- Publish Status Active
- Publish Country US
- Imprint Econo-Clad Books, Div. of American Cos., Inc.
- Edition Turtleback School & Library ed.
- Format Hardcover
- Language English