Focusing on human interaction with the dense built environment in a city, this essay explores the experienced space, i.e. the physical built space and the perceived space as one dimension. From this perspective, the essay considers the visual information that the built environment projects. The essay proposes a theorem for understanding and categorizing architecture based on its potential diversity of activities that the building encapsulates. The ability to interpret and challenge the perceived understanding of the built environment supplies the basis for the key concept of this essay: multi-faceted architecture. In this essay, multi-faceted architecture is a motto for architectural design and planning, and derives from the fact that the very meaning of a function for a given piece of architecture is something that needs to be addressed further by the architect, designer or other building experts. As our modern cities expand at an ever-increasingly higher speed, the need for public space with a multi-faceted architecture is needed more than before. Firstly, the essay defines the concept of multi-faceted architecture and its constituents. Secondly, the essay supplies a framework for analysing Multifaceted architecture and a way of categorizing it. This essay aims at opening a deeper dialogue on architectural quality based upon theory from current architectural theorists and architectural theory. The essay uses a sociological perspective to understand why appropriate architecture, in the context of the surrounding environment, can lead to a more successful activation of a given space. To test the theorem that concerns multi-faceted architecture, the theorem is applied and tested in the old city of Malmö. Due to the COVID-19 virus outbreak, these tests have been executed virtually. Thirdly, this essay reflects upon the role of multi-faceted architecture in a modern city.