This text examines the phenomenological and ontological nature of uniqueness within a world comprised of individual entities. The author posits that although the world is made up of unique individuals, this uniqueness often fades under a layer of similarities that appear to predominate. This phenomenon is largely attributed to the subjective inability of perceiving entities to distinguish fine details, resulting from a relatively high threshold of reactivity. This tendency is most pronounced at lower levels of complexity and organization. However, at the level of living beings, specific abilities to differentiate and react have developed based on a focus on particular differences rather than uniqueness itself. Organisms are capable of survival and reproduction primarily through more or less coarse differentiation or selection, such as in the process of nutrient intake. The text thus reflects on the relationship between the objective existence of the unique and the subjective processes of categorization and selection essential for life. Differentiation and selection are viewed as fundamental mechanisms through which living systems navigate environmental complexity, overcoming the apparent uniformity caused by limited subjective perception.