This text explores the relationship between the complexity of systems and the probability of their re-emergence. The author posits that as the complexity of a system increases, the likelihood of an identical or similar system appearing spontaneously decreases significantly. In living organisms, this challenge is overcome by the invention of reproduction, which allows for the multiplication of highly complex entities that would otherwise be unlikely to arise again. Analogies can also be found in non-living systems, such as the evolution of stars and stellar systems. The document reflects on how scientific tradition prioritizes similarities and classification into genera or species, while the capture of uniqueness is often relegated to artistic endeavors. Although practical daily life tends toward categorization and leveling, our authentic existence relies on personal relationships with unique individuals and objects. The author suggests that while classification serves scientific processing, acknowledging uniqueness is essential for a true understanding of life. This fundamental duality between general categories and irreplaceable uniqueness defines our perception of the world.