This book reopens the experience of the individual. What we call reality is not a mere reflection of the external world, but an inner construct shaped within the brain and mind. Here, fundamental concepts such as perception, memory, pleasure and suffering, will, consciousness, and death are revisited in the light of neuroscience findings and philosophical reflection. The text demonstrates how biological, cultural, and lived backgrounds intertwine with the brain’s predictive mechanisms, continuously reconstructing the world we experience in every moment. This work seeks to provide intellectual coherence through the fusion of science and philosophy, offering a perspective in which reality emerges not as self-evident or uniform, but as a dynamic and interpretable process.