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In this contribution we propose a set of 6 sonification techniques to recognize simple shapes on touchscreen devices. We also adopt an experimental methodology, based on gamification principles, to conduct a large scale evaluation. Invisible Puzzle is a mobile application that implements this methodology and makes it possible to conduct non-supervised evaluation sessions.
With Invisible Puzzle we conducted 131 tests with sighted subjects and 18 tests with subjects with blindness. All subjects involved in the process successfully completed the evaluation session, with high engagement, hence showing the effectiveness of the evaluation procedure. Results give interesting insights on the differences among the sonification techniques and, most importantly, show that, after a short training, subjects are able to identify many different shapes.
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