Read a short essay by Deleuze in his Deserted Islands called “Faces and Surfaces” today. It’s an interview/conversation with artist Stefan Czerkinsky, who asks Deleuze, “What precautions should be taken when producing a concept?” Deleuze replies,
You put your blinker on, and check in your rearview mirror to make sure another
concept isn’t coming up behind you; once you’ve taken these precautions, you
produce the concept. (282)
This sentence is footnoted, and the note says,
Concepts are not in your head; they are things, peoples, zones, regions,
thresholds, gradients, temperatures, speeds, etc. (312)
This note reminds me of their essentially anti-metaphorical stance.