Another part of the course was a discussion of dimension, including reading

*Flatland*and building polyhedra and polytope models with Zometool. Inspired by this work (and by Doctor Demento,) I created a "Doctor Dimension" skit for a school talent show. Later, Doctor Dimension showed up in

*Algebra: Themes, Tools, Concepts*where his two-dimensional impersonation poured 2-D liquids into 2-D containers:

Later yet, Doctor Dimension made an appearance in my precalculus and calculus classes, where he raised questions about concavity, continuity, and differentiability. And finally, yesterday, he set up his lab on my Web site, to share his collected works, plus four new interactive animations.

He awaits your visit!

--Henri

PS: read about a fifth interactive animation, and more on Doctor Dimension here!

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