The act of creatively transfiguring a space (here, with an expressly transgressive purpose in mind): 

"If it is true that a spatial order organizes an ensemble of possibilities (e.g., by a place in which one can move) and interdictions (e.g., by a wall that prevents one from going further), then the walker actualizes some of these possibilities. In that way, he makes them exist as well as emerge. But he also moves them about and he invents others, since the crossing, drifting away, or improvisation of walking privilege, transform or abandon spatial elements."
           -- Michel de Certeau, "The Practice of Everyday Life"