"Looking Into Mathematics: A Visual Invitation to Mathematical Thinking"
describes research in mathematics education and visualization;
I was a consultant on that project, and my
fall 1997 First-Year Seminar
(Math 108, "Looking Into Mathematics") was one of the
pilot sections described in the abstract.
Some of the "new visual tools" mentioned
were developed by my fellow consultant Jeff
Weeks (holder of a MacArthur Foundation "genius
grant" for 1999-2000) and can be explored at his
Geometry Software web page.