In today's world, product design must go beyond function and address consumers' emotional and psychological well-being. This calls for a comprehensive strategy that includes design psychology into the fabric of human-computer interaction interfaces. Understanding human behavior and perception allows designers to develop interfaces that connect with people on a deeper level. The term "Psychology of Design" emphasizes the necessity of studying how human perception effects the design and function of things. It recognizes that design is more than just aesthetics; it is also about how consumers perceive and interact with the product. Integrating psychology into design philosophy represents a paradigm change, acknowledging that good design goes beyond addressing fundamental requirements and involves developing emotional connections. This transition is critical to guaranteeing the lifespan. Keywords— Human perception effects, design psychology.