  Digitalization is penetrating every aspect of everyday life including a
human's heart beating, which can easily be sensed by wearable sensors and
displayed for others to see, feel, and potentially "bodily resonate" with.
Previous work in studying human interactions and interaction designs with
physiological data, such as a heart's pulse rate, have argued that feeding it
back to the users may, for example support users' mindfulness and
self-awareness during various everyday activities and ultimately support their
wellbeing. Inspired by Somaesthetics as a discipline, which focuses on an
appreciation of the living body's role in all our experiences, we designed and
explored mobile tangible heart beat displays, which enable rich forms of bodily
experiencing oneself and others in social proximity. In this paper, we first
report on the design process of tangible heart displays and then present
results of a field study with 30 pairs of participants. Participants were asked
to use the tangible heart displays during watching movies together and report
their experience in three different heart display conditions (i.e., displaying
their own heart beat, their partner's heart beat, and watching a movie without
a heart display). We found, for example that participants reported significant
effects in experiencing sensory immersion when they felt their own heart beats
compared to the condition without any heart beat display, and that feeling
their partner's heart beats resulted in significant effects on social
experience. We refer to resonance theory to discuss the results, highlighting
the potential of how ubiquitous technology could utilize physiological data to
provide resonance in a modern society facing social acceleration.
