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Mobile phones can help one stay connected with friends, family, and colleagues. Yet they can also sometimes isolate one from the physical world around one, drawing the attention into a relatively private, personal, digital world of calls, text messages, and email. Further, mobile phones' small screen size and limited viewing angle make it difficult to share displayed information with co-present people. One can hold a phone up for others to see or pass it around yet neither strategy adequately facilitates simultaneous group-based communication or lightweight, opportunistic interaction. Public displays, in contrast, present information to many people simultaneously, and have been shown to catalyze conversation and interaction.
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