Golsteijn, C;    Gallacher, S;    Koeman, L;    Wall, L;    Andberg, S;    Rogers, Y;    Capra, L;      (2015)    VoxBox: A Tangible Machine that Gathers Opinions from the Public at Events.                     In: Verplank, B and Ju, W and Antle, AN and Mazalek, A and Mueller, F, (eds.) TEI '15: Proceedings of the Ninth International Conference on Tangible, Embedded, and Embodied Interaction.  (pp. pp. 201-208).  Association for Computing Machinery (ACM): New York, NY, USA.       Green open access