This text addresses the ontological issue of unity and integrity within the context of reactivity. The author emphasizes the necessity of distinguishing between various forms and levels of integration, thereby complicating the traditional dichotomy between mere "heaps" and structured "wholes." It is suggested that this distinction is more a matter of practical application than a fundamental ontological principle. A significant point of reflection is the conceptualization of the entire universe as a single whole, albeit one characterized by a very low level of integration. In this context, the author considers the cosmological phenomenon of inflation and the continuous expansion of the universe, which may face limitations at the event horizon. These limits are defined by the capacity to react to stimuli, even in a primitive manner, raising questions about the boundaries of causal and interactive interconnectedness within the cosmic whole. The text calls for a deeper philosophical examination of the relationship between the physical parameters of the universe and concepts of wholeness.