Although recent studies have attempted to clarify the daily dynamics between moods and creativity, relatively limited studies have explored how daily positive and negative activating moods influence "changes" in daily creativity (i.e., controlling for the effects of prior daily creativity) in real organizations. Furthermore, although the importance of the physical working environment has been highlighted in the creativity literature, it remains unclear how the dimensions of the physical working environment (i.e., "adjustability of work area" and "facilitation of informal communication") influence employees' daily creativity directly or moderate the effects of daily activating moods on creativity. Using the daily diary research design, we collect lagged daily data from 70 creative workers across ten consecutive working days, yielding 662 valid matched daily responses. The results of multilevel path analysis show that both daily positive/negative activating moods had lagged and positive effects on changes in subsequent creativity, and the physical environment that facilitates informal interactions strengthened these positive lagged effects. Besides, a physical environment that facilitates informal interactions also directly predicted changes in daily creativity. Surprisingly, the work area's adjustability attenuated the positive lagged effect of daily positive activating moods on daily creativity.