Among the interesting mobile-tangible projects are systems that
involve wearables, games, and environmental sensing. For
example, WeWrite [20]—which employs mobile phones and the
LilyPad Arduino [7]—enables users to send text messages to a Tshirt
that then displays them on a built-in LED display. Another
wearable-based project, called united-pulse [19], uses electronic
rings, heart rate monitors and smart phones to communicate heart
rate across distance. The rings communicate with the phone and
monitors to enable two people to feel each other’s pulses
remotely. A less poetic, but perhaps more useful application, eyeq
consists of a small display mounted on the inside of a pair of
glasses that delivers peripheral visual cues to its wearer about
phone events [8]. Other applications include games that motivate
their players to be physically active [9], and environmental sensor
networks which rely on mobile and tangible nodes that
communicate with one another (cf MobSens [13]) .