In 1996, the anthropologist Eduardo Viveiros de Castro chose a sentence by Gilles Deleuze as the epigraph for an article, published in the Brazilian journal Mana, on Amerindian perspectivism. (A modified version of the article appeared in English two years later, in the Journal of the Royal Anthropological Institute.) Since then, Deleuze's name has appeared often in works about perspectivism, but Chamois's new book is the first monograph to focus on perspectivism and Deleuze. Among the most important contributions of Chamois's analysis is to draw our attention to a little-known passage in a course, “Truth and Time,” that Deleuze taught in 1983 (and that is available for listening online). In it, he criticizes the example of the cube used as a paradigm, at least since Edmund Husserl's day, to conceptualize what a perspective is. It is impossible to see all six faces of a cube at the same time; thus, to “intuit” the cube as a cube, we must add to our own perception of a profile of the cube more possible points of view on it. The problem with this example and description is that it takes for granted that the subject already knows what she needs to see (a cube).Inspired, however, by the process philosophy of Alfred North Whitehead, Deleuze holds that each perception is an invitation to other perceptions: “To perceive is to become capable of perceiving more and more things that were initially not perceived” (percevoir, c'est devenir apte à percevoir de plus en plus de choses qui d'abord n’étaient pas perçues). Deleuze contrasts the “spatial” or “frozen” notion of perspective to the “temporal perspective” that he seeks to emphasize: “It's time that acts as perspective” (C'est le temps qui agit comme perspective). The question, therefore, at the heart of Deleuze's perspectivism is how a perspective changes over time. Chamois goes through the early texts of Deleuze to show how the idea of the temporal perspective emerged from the concept of the structure Autrui. The “structure-Other” is best exemplified by someone else's emotive face—the frightened face of my friend, for instance. If I perceive that face while, say, I am laughing, another possible world would slip into my own: a frightening world penetrates my humorous one, and perhaps I should turn my head to see what danger may be en route. As in the case of the cube, my own limited perception is supplemented by others’ limited perceptions. The object of perception in this case, however, is not presupposed to be stable (the world is changing), and what I am about to see is not known in advance.But what, precisely, in the face of the other must I notice to become aware of the world she perceives? Deleuze does not explore that question in any detail, but Chamois reviews recent anthropological and psychological research that supplies some elements of a response. To confront the writings of Deleuze with relevant scientific data is fruitful. I must admit, though, that I was a bit embarrassed by the framing of the discussion: Chamois presents Deleuze's concepts as hypotheses demanding verification that they are “corroborated by the facts.” For Deleuze, concepts are inseparable from percepts and affects; as opposed to a hypothesis, a concept is true not because it correlates to a set of relevant facts but because it helps us to perceive other aspects of the world (percept) and induces us to act better (affect). Thus, the minute and rewarding analysis of Chamois should be complemented with an assessment of what we learn to focus on and of how we change our actions thanks to the perspectivism of Deleuze—in contrast to other forms of perspectivism (or indeed to other cosmologies).