Dozens of couples dance in a circle, a house topples down a slope, a cat manically revolves around itself. A few seconds beforehand, an admonishing voice points out that a centuries-old philosophical assumption is under close scrutiny. It is René Descartes’ first tenet, »I think, therefore I am,« that the British neurologist Raymond Tallis calls into question in the video by the artist Johan Grimonprez. Tallis takes the view that human consciousness is not an individual construction but exists above all in relation to a vis-à-vis.