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In recent years, touchless-enabling technologies have been more and more adopted for providing public displays with gestural interactivity. This has led to the need for novel visual interfaces aimed at solving issues such as communicating interactivity to users, as well as supporting immediate usability and "natural" interactions. In this paper, we focus our investigation on a visual interface based only on the use of in-air direct manipulations. Our study aims at evaluating whether and how thedoi:10.1145/3078810.3078831 dblp:conf/perdis/GentileSMMG17 fatcat:5vkw3z7qlfcuhd2ygccxgtq6ga