[ Memories combine with the empathy and solidarity discussed in Chapter 1 to make a powerful platform from which visitors can act. In this chapter, I look at physical experiences in the museum, paying special attention to the promises and challenges of immersive environments. I explore what makes some immersive environments successful and others not. What are the roles of keystone objects? What happens when objects or artworks become environments? When and how is it advantageous to slow down or stop an emotional experience?]