StringWall: A Low-Budget, Projection-Based Tangible User Interface
Jana Hoffard, Shio Miyafuji, Hideki Koike · Proceedings of the ACM on Human-Computer Interaction · 2025
Efficient space division is increasingly important as space is decreasing for both apartments and offices, where the average person spends most of their time. Therefore, it is essential to explore additional ways to separate and cover space without preventing its accessibility, while also providing possibilities for personalization by the individual. To achieve this, we present StringWall, a tangible, projection-based user interface created from low-cost materials that can be integrated into any space or size. It consists of rubber strings tracked by a depth camera that can be adapted to the user's needs in terms of size and orientation. To evaluate our system, we conducted visibility tests for the projection and background under different conditions. Furthermore, we conducted two preliminary studies to explore the users' preferences in terms of different interaction methods and use cases, as well as the haptic feedback capabilities of our system. The results show that users found the system and proposed use cases engaging, and that the system is suitable for providing extended haptic feedback when physical restraints align with the user's expectations. We further provide a demonstration of two versions of a shelf prototype incorporating the StringWall and its interactions.