Abstract
This chapter proposes an extension of Georges Canguilhem's historical analysis toward contemporary concepts of milieu as flexible and dissipative territories, and as "adaptive landscapes" of living organisms such as the monarch butterfly and common swift. The chapter deploys and develops an understanding of certain vital processes in Canguilhem's account of milieu, by charting the experience to be found in various migration landscapes which cannot be understood independently of their taking place over time (and certainly not in abstraction). This is reflected in the second section where an account of dissipative images is given as a way of thinking the ephemerality of structures whose ramifications occlude the ongoing radiance of their energy. This much can be seen, as the chapter concludes, in the work of Gemma Anderson whose drawings of mitosis and epigenetic landscapes contemplate, through a set of visual "notes," how we might begin to both think and render energy fluctuations. We can thus visualize migratory patterns not as a series of fixed points but in a way that might help us to see "sky" as a unique, dynamic milieu of lived time and space.