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In this paper we describe an experimental study investigating the use of bimanual and multi-finger input for grouping items spatially on a tabletop interface. In a singleuser setup, we compared two typical interaction techniques supporting this task. We studied the grouping and regrouping performance in general and the use of bimanual and multi-finger input in particular. Our results show that the traditional container concept may not be an adequate fit for interactive tabletops. Rather, wedoi:10.1145/2399016.2399091 dblp:conf/nordichi/GeyerHR12 fatcat:w6qshfw2vjb4ties5bhhikzgqq