Turtle Geometry: The Computer as a Medium for Exploring Mathematics
Hal Abelson is Class of 1922 Professor of Computer Science and Engineering at Massachusetts Institute of Technology and a fellow of the IEEE. He is a founding director of Creative Commons, Public Knowledge, and theFree Software Foundation. Additionally, he serves as co-chair for the MIT Council on Educational Technology.
Andrea diSessa is Chancellor's Professor in the Graduate School of Education at the University of California, Berkeley, and a member of the National Academy of Education. He is the coauthor of Turtle Geometry: The Computer as a Medium for Exploring Mathematics (MIT Press, 1981).
5: Turtle Escapes the Plane