Samenvatting

In this paper, we present and discuss Ivy, a critical artifact offering a novel design perspective on interventions that aim to reduce sedentary behavior in office workers. Ivy is an interactive office chair that represents the amount of sitting time through growing ivy strands. Using the matrix of common argument types by Bardzell et al., we propose a structured "reading" of Ivy, as an example supporting reasoned and accessible conversations about criticality in design. Our reading of Ivy emphasized that its criticality emerges mainly from data physicalization as a new
form of interactivity intended to trigger reflectiveness. The insights of this design study contribute towards a
critical perspective on designing interventions to reduce sedentary time and spark discussion amongst designers
and researchers in the field of Human-Computer Interaction.