This text explores Aristotle's conception of motion and change, focusing on the distinction between self-initiated movement and being moved by an external agent. The author highlights the epistemological problem of observation: it is often impossible to discern at first glance whether an object moves by its own internal power (energeia) or is merely subject to external forces. Using the example of a flowing river, the text illustrates how modern scientific explanations, such as gravity, are theoretical interpretations rather than direct observations. These constructs rely on a complex network of experiences and logical connections. Furthermore, the abstract addresses the concept of qualitative change (alloiósis) and examines the ontological assumption that some underlying substance must remain unchanged for a thing to maintain its identity. The reflection suggests that our understanding of physical reality is fundamentally shaped by theoretical frameworks and the presupposition of a persistent substratum. This philosophical inquiry challenges the simplicity of direct perception in favor of a deeper analysis of the nature of change.