The document summarizes research on tangible user interfaces (TUIs). It discusses key works and definitions in the field from 1994 to 2014. It analyzes several TUI projects based on their representation (iconic or symbolic), interaction type (spatial, relational, constructive), and feedback modalities (visual, audio, tactile). Research areas are identified, such as feedback modalities and the relationship between tasks and interface tools. The analysis is used to hypothesize that feedback represented through physical manifestation may have better performance than visual feedback. An experiment is proposed to test this, investigating the influence of feedback on task completion time, error rates, and user satisfaction and preference.
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