This lecture explores the concepts of immersion, presence, and flow in virtual reality environments. It delves into the technical characteristics of immersive virtual environments, the importance of depth cues, and the assessment of immersion levels. The distinction between presence and immersion is discussed, along with the evaluation of presence through questionnaires and objective measures. The lecture also covers the concept of flow, introduced by psychologist Csikszentmihalyi, and its relation to engagement and skill-challenge balance. It concludes by emphasizing critical factors for immersive visual displays and the subjective nature of presence in virtual environments.