This text examines the transformation of the philosophical understanding of reality through the concepts of actuality and presence. It explores how traditional philosophy equated reality with permanence and immutability, creating a tension in the interpretation of FYSIS (nature). If only that which is eternal and unchanging is considered truly real, then the processes of birth, change, and death are pushed to the margins of ontological significance. A pivotal shift occurs with Aristotle, who attempts to systematically rehabilitate movement as a subject of theoretical inquiry (theoria). Although Aristotle remains partially influenced by the Parmenidean tradition—which denies the possibility of scientific knowledge (episteme) regarding the changing—he nevertheless becomes the founder of the science of movement and change. However, this emerging "physics" entails a reduction of life to the general category of movement. The author analyzes how this ontological preference for stability shaped the foundations of Western thought and the scientific approach to nature, highlighting the tension between a static conception of being and the dynamic nature of the world.