Space has always been the subliminal theme of the architectural project. Despite which fact, its explicit consideration as part of the architectural theory is relatively recent.

Through the research, observation and practical exercise, present work attempts to contribute into the developing theory of architectural space, considering both its formal and experiential dimensions in a number of case studies.

Four spatial sub-categories constitute the formal part of the enquiry and give the structure to the work in general: space of building – or of-space, space on building – or on-space, space in building – or in-space, and inter-space. Each sub-category is individually considered in four dedicated chapters, while in the final one they are considered together as parts of the unified spatial whole.

The case-studies are observed through the drawings and essays. While the experience is described in the essays, the formal definition of the spatial sub-categories is shown in the interpretive hand drawings.

The work offers basic methodological principles of spatial categorization with related theoretical premises for further integration with the growing body of research into the architectural space.