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These are companion manipulatives to Geometry Labs.
Articles in The Mathematics Teacher:
"Why I Use Interactive Whiteboards" (The Mathematics Teacher, November 2010.)
With Jonathan Choate, "Iterating Linear Functions" (February 1997), an introduction to dynamical systems.
"Make These Designs", an electronic graphing lesson on linear functions (May 1996).
Also: Delving into Functions with Function Diagrams in NCTM's online journal ON-Math (Volume 5, #1, 2006-2007).
On this site: Function Diagrams