  Digitally presenting physiological signals as biofeedback to users raises
awareness of both body and mind. This paper describes the effectiveness of
conveying a physiological signal often overlooked for communication: breathing.
We present the design and development of digital breathing patterns and their
evaluation along three output modalities: visual, audio, and haptic. We also
present Breeze, a wearable pendant placed around the neck that measures
breathing and sends biofeedback in real-time. We evaluated how the breathing
patterns were interpreted in a fixed environment and gathered qualitative data
on the wearable device's design. We found that participants intentionally
modified their own breathing to match the biofeedback, as a technique for
understanding the underlying emotion. Our results describe how the features of
the breathing patterns and the feedback modalities influenced participants'
perception. We include guidelines and suggested use cases, such as Breeze being
used by loved ones to increase connectedness and empathy.
