Tangeo: geometric drawing with tangibles on an interactive table-top

We introduce Tangeo, a drawing system that combines tangible drawing tools, such as rulers, protractors and set squares with a table-top environment. Geometric drawing on computers is often constrained to abstract widget tools and metaphoric, indirect input methods such as mouse and keyboard. Tangeo allows users to construct geometric drawings in a more direct manner by manipulating virtual data with familiar physical objects and drawing with a finger. User evaluations on Tangeo yielded a high rate of user satisfaction and indicated that the system is effective at enhancing geometric drawing.