This study introduces CalmaStep, a system designed to physicalize collective stress with an integrated notification feature. The prototype anonymously displays individual stress levels in a modular format, encouraging playful interactions and the exchange of subtle messages within an office setting while accommodating preferences for emotional privacy. Quantitative methods have been used to measure changes of stress levels following notifications, while qualitative methods have been used to investigate participants’ interpretations of the notifications and the resulting social dynamics. The quantitative analysis did not show a significant reduction in stress levels, while qualitative findings demonstrated CalmaStep’s potential to promote discussions on common topics and enhance social dynamics.