Martin Kraus: Direct Manipulation of Parametrized Graphics

	Outlook

	Acknowledgments
	Eric W. Weisstein for many ideas
	several people at the University of Stuttgart and WRI for comments
	Rüdiger Dietrich, Robin Lehmann, Lars Schäfer, and Dean Simec (students at the University of Stuttgart) for implementing a first version of the expression parser and evaluator
	Maurice Starck for many ideas and the perfect testing environment