We introduce DayClo, an interactive clock visualizing schedule data for supporting users to reflect and self-track themselves in their daily lives. DayClo is designed by applying the form and time representation method of analog clocks. It shows the user's upcoming schedules through the sequential movement of two clock hands with hidden LEDs and a display. We deployed DayClo in eight participants' working spaces for a month to explore how the design and its interaction could support their reflections on their scheduling practices. The findings revealed that DayClo supported users' casual access to the schedule data and motivated self-tracking of their plans. Moreover, the moving clock hands revealed the empty time of their schedules and helped to draw new plans for their implicit goal. Our findings suggest new opportunities for designing everyday objects as a medium of delivering and fostering spontaneous interaction with personal data for self-reflection.

We introduce Bookly, an interactive artifact that physically represents the accumulated time of users' reading activity through abstract volumetric changes. Bookly accumulates the time of actions (e.g., picking up and putting down books) that users performed for reading and provides a designated space for the ongoing book being read. The results of our 2-week in-field study with six participants showed that continuous exposure to volumetric changes representing the accumulated time of reading activities helped the users to understand their unsettled reading patterns. Bookly also motivated the users to improve their reading behavior by gradually making reading part of their schedules. Additionally, the definite distinction of the ongoing book improved its visual affordance and accessibility for the users to start reading books. Based on the findings, we confirmed the possibility of making intangible data physical for self-reflection to enhance changes in behaviors that are difficult to perform due to weak motivation.