This text examines the ontological definition of structure in relation to the subject and interiority. The author argues for a more precise distinction between structures accessible from the outside and those pertaining to the non-objective aspects of true beings. A fundamental distinction is made between a mere aggregate and a genuine whole, where internal integration serves as the basis for external, organic unity. In the context of organisms, one must differentiate between the physical structure of the body and the meaningful interplay of organs that constitutes interiority. To grasp this inner dimension, a shift from traditional objectifying thought to a non-objectifying approach is required. The subject cannot be reduced to a simple structure without acknowledging the dual nature of structures—those externally accessible and those that are not. Ultimately, the external structure of a subject remains incomplete unless it is linked to its center, the subject itself, which cannot be reduced to its objective side. This framework allows for the conceptualization of structures within the realm of interiority and pure non-objectivity.