This paper describes the project ‘Harmonic Paper’, an interactive interface that converts a user’s drawing into music. By means of a microcontroller and series of photocells, the installation can detect diverse features (location, thickness) of physical drawing in a letter-size paper, and convert them into musical components (note, volume, tempo) with visual feedback (color light). We also provide a custom-designed software that allows users to virtually practice this hardware installation. This set of software and hardware helps user to explore new musical and visual expression through an understanding of audio-visual relationship.

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