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Fig. 1: Demonstration of proximity and transition cues in an augmented reality city information system scenario. Being aware of newly emerging, yet potentially important information can become difficult in dynamic environments. Proximity cues (left side) provide spatial information in either the visual or the auditory modality and help users to become aware of out-of-view objects ("target"). When the target crosses the border of the field of view of the visual output device, the proximity cue is replaced by a transition cue (right side). A short visual, auditory or tactile notification signals the user that the target entered the field of view and is potentially visible.

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