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In the context of a classroom lesson, concepts must be visualized andorganized in many ways depending on the needs of the teacher and students.Traditional presentation media such as the blackboard or electronic whiteboardallow for static hand-drawn images, and slideshow software may be used togenerate linear sequences of text and pre-animated images. However, none ofthese media support the creation of dynamic visualizations that can bemanipulated, combined, or re-animated in real-time, and so demonstrating newconcepts or adapting to changes in the requirements of a presentation is achallenge. Thus, we propose Chalktalk as a solution. Chalktalk is anopen-source presentation and visualization tool in which the user's drawingsare recognized as animated and interactive "sketches," which the user controlsvia mouse gestures. Sketches help users demonstrate and experiment with complexideas (e.g. computer graphics, procedural animation, logic) during a livepresentation without needing to create and structure all content ahead of time.Because sketches can interoperate and be programmed to represent underlyingdata in multiple ways, Chalktalk presents the opportunity to visualize keyconcepts in computer science: especially data structures, whose data and formchange over time due to the variety of interactions within a computer system.To show Chalktalk's capabilities, we have prototyped sketch implementations forbinary search tree (BST) and stack (LIFO) data structures, which take advantageof sketches' ability to interact and change at run-time. We discuss theseprototypes and conclude with considerations for future research using theChalktalk platform.

Chalktalk : A Visualization and Communication Language -- As a Tool in the Domain of Computer Science Education