This article proposes the double perspective of a cosmogenesis and a cosmic experimentation as the two directions that a Deleuzian cosmology could take following Difference and Repetition. In order to do so, we take the concept of intensity (intensive quantity) not only as the main guiding thread of our inquiry but also as the axis of comprehension of a dynamic conception of space and time (the so called theory of spatio-temporal dynamisms). Under such conditions, we will analyze how a process of genesis discovers the emergence of the cosmos, first of all, in the creation of multiple lines of differenciation based on the complication of its various spatio-temporal modalities. Afterwards, a cosmic experimentation will describe how an individual experience (a life, a sensibility) may provide a second perspective on the cosmos by establishing a clear-confused explication of such genetic spatio-temporal modalities. In this way, made explicit between two registers, the notion of cosmos will finally appear as a phantastical notion insofar as it is equivalent to the reciprocal relationship woven between a genetic process of transformation and an empirical process of development.