This chapter uses the concept of ambience as an analytical tool to explore the qualities of cultural participation in the outdoor public spaces of contemporary cultural precincts, and as a metaphor that speaks to a wider process of cultural transformation in communicative cities. Media-rich cultural precincts are now a common feature of urban developments and inform the major policy shifts in creativity-led urban regeneration. The ambient experiences afforded by outdoor cultural precincts resonate with significant shifts in artistic practice. Ambient participation is particularly difficult to account for in the instrumental frameworks and methods routinely used by cultural funders and stakeholders to evaluate the impact of cultural infrastructure. Frameworks designed to measure visitation numbers at a museum, the satisfaction surveys of audiences, or the segmentation and brand recognition indicators tested by market research frame cultural participation as an aggregation of individual experiences. Media-saturated environments make qualitative changes to the experience of being-together-in-public.