Reflection serves a vital analytical function by dividing experience into subjective and objective components. The author illustrates this process using a practical example of a faulty light switch, where an ill-conceived attempt at repair leads to a short circuit. In this context, reflection is defined as the retrospective mental examination of one's own actions. Through such analysis, an individual can distinguish their intentional interventions from the inherent properties and reactions of the external world. This process is more than a tool for technical troubleshooting; it primarily establishes the subject's relationship with themselves. By reflecting, the subject recognizes their own agency and responsibility for changes in the environment that would not have occurred without their intervention. This differentiation has an experimental nature, operating through trial and error. Ultimately, this self-awareness provides the necessary foundation for understanding other subjects who possess similar capacities for action and reflection, thereby enabling a deeper comprehension of intersubjectivity and conscious existence.