This paper draws on artistic explorations of territorial and spatial forces through analysis of projects set in the natural landscape, in a specific indoor site or at the threshold between the two. Specific attention is given to the artistic processes at play in the transformation of materials created/collected in the natural environment when shaped for presentation in an indoor location. What is the relation between being and becoming in this liminal space? According to Erwin Straus, the impetus to this process is the pathic moment of sensation, a moment which evolves in two dimensions: as an unfolding of the world and of the self (Straus 1965). Louis Schreel argues that in Deleuze and Guattari, artistic practice activates a process in which «the work ‘captures’ forces at work in the world and renders these sensible. Its effects are above all real and not merely imaginary: the image is not a mental given but a concrete, existing reality» (Schreel 2014: 100). Here, Deleuze distinguishes between the percept – landscape in the absence of man – and affect, the non-human becomings contained in the artwork. This paper wishes to unpack these processes through a study of two concrete instances of artistic practice, aiming to create immediate interaction between musician and environment, in which either of the two authors took part.