“…Nonplanar handheld displays have long intrigued HCI researchers [52], as these expand the range of potential interaction techniques to include operations such as bending [1,9,27,50,59,60] , rolling [25,48], and folding [7,10,24,34,48,54,70] the device. The ensuing affordances benefit notification UIs [9], viewport transformations [10,29], and optimize screen real estate [7,24,48,70]. Works such as [15,62] hint at the possibility of inter-display interactions with flexible digital paper displays.…”