Credit: Huankai Chen Huankai Chen (CN) An interactive postcard for sick children to share their mood. Tags:childrencommunication designcritical designdesign prototypingdesign researchdigital artsescapeexperience designforesight and insightillnessinteractioninteraction designmoodnarrativesopen-source digital platformsphysical computingpostcardspeculative designuser-centered design