What spatial flow means in practice
Spatial flow describes the ease with which a person moves through an interior and the visual continuity experienced from one position to another. In a room with high spatial flow, sightlines are unobstructed, transitions between zones are gradual rather than abrupt, and the path from any point to any other point is clear without requiring detours around furniture or architectural elements.
This is not the same as open plan in the colloquial sense — a single large room with a kitchen at one end and a sofa at the other. Spatial flow is a property of the relationship between elements rather than the absence of walls. A well-divided apartment with doors aligned on a single axis can have higher spatial flow than a poorly arranged open-plan space where furniture has been distributed without attention to circulation.
Polish residential context: the panel block legacy
The majority of urban residents in Poland live in apartment buildings constructed between 1950 and 1990 using prefabricated concrete panel systems — locally referred to as wielka płyta (large panel). These buildings were designed under standardised regulations that prescribed apartment sizes, room dimensions, and corridor widths. A typical 48–52 sqm apartment from this period has four or five rooms — kitchen, bathroom, toilet, main room, and a sleeping room — each separated by non-structural partition walls.
The non-structural nature of these partition walls is significant: they can be removed without affecting the structural integrity of the building, which uses a load-bearing frame of columns and cross-walls positioned at intervals determined by the module of the prefabricated panels. This has created a specific renovation pattern in Polish cities: residents of wielka płyta apartments remove the wall between the kitchen and the main room to create an open-plan living space, recovering three to five square metres of effective floor area and dramatically improving natural light distribution.
A sightline from the kitchen to the exterior window is not a luxury — in a compact apartment, it is the primary tool for making the space feel liveable rather than enclosed.
Circulation paths and the 90cm rule
Building regulations in Poland specify a minimum corridor width of 90 centimetres for residential spaces (PN-ISO 9386 and the relevant provisions of the Warunki Techniczne). In minimalist interiors, this minimum is treated as a design parameter rather than a constraint to exceed: furniture placement is organised so that principal circulation paths maintain exactly this width, which keeps the floor area devoted to movement at its minimum while remaining comfortable for regular use.
The 90cm path is sufficient for one adult moving without restriction and can accommodate two people passing if one turns sideways. For households with wheelchair users or those planning for reduced mobility, 120cm is the functional minimum for parallel movement, and doorway widths become a separate consideration.
In practice, the main circulation decisions in an open-plan Polish apartment concern the path from the entrance to the kitchen counter, from the kitchen to the dining position, and from the dining position to the sofa. These three segments, when mapped, reveal whether furniture has been placed to support movement or to fill visual space.
Natural light distribution in open plans
The conventional objection to opening kitchen and living spaces in older Polish apartments is that it disrupts the natural light zoning: the kitchen, frequently positioned on an internal wall with a single window, loses its light source when merged with the larger main room. The main room, typically with south or west-facing windows in buildings where the orientation permits it, has a surplus of afternoon light.
When the wall between these spaces is removed, the light from the main room windows extends into the former kitchen area. The net effect depends on the depth of the apartment — the distance from the exterior wall to the kitchen's original position. In apartments where this depth is less than seven metres, the light distribution after opening is generally adequate throughout the day. In deeper apartments, the kitchen position may still require supplementary artificial lighting during morning hours regardless of the wall configuration.
The quality of that artificial light then becomes a design consideration in its own right. Minimalist kitchens in open-plan Polish apartments frequently use recessed ceiling fittings with warm-white LED sources (2700–3000K) that match the tone of incandescent light. This maintains consistency with the natural light quality rather than introducing a colour-temperature discontinuity visible from the living area.
Zone definition without walls
Removing a wall does not eliminate the need for zone definition — it changes the tools available. In an open-plan minimalist interior, zones are typically defined by one or more of the following methods:
- Floor material transition: A change from poured concrete to oak strip flooring at the boundary between the kitchen and living zones. The threshold is level — no step — but the material shift communicates a functional division.
- Ceiling height variation: Where structural possibilities allow, a lower section of ceiling over the kitchen counter — achieved with a dropped plasterboard soffit — separates the cooking zone from the higher-ceilinged living area. This is more common in new-build projects than in renovations of existing buildings.
- Rug placement: A single rug under the sofa and coffee table defines the living zone without any physical barrier. The rug's perimeter functions as the zone boundary. In minimalist interiors, a single large rug — typically 200×300cm or larger — is preferred over multiple smaller rugs that would fragment the floor plane.
- Lighting zoning: Kitchen and dining zones are lit from above (pendant or recessed ceiling); the living zone uses floor and table lamps that keep the light source below eye level. This difference in light source position creates a perceptible zone distinction even when viewed from a distance.
The dormitory room as an alternative model
Not all minimalist interiors prioritise open plans. The dormitory room — a single compact room serving multiple functions through the careful arrangement of fixed and movable elements — represents an alternative interpretation of spatial minimalism. Historic examples include the Spartan simplicity of monastic cells and the efficiency-focused layouts of Shaker communal living spaces.
In contemporary Polish residential design, this model appears in single-room studio apartments, where a sleeping area, working area, and sitting area must coexist in 25–35 sqm without visual chaos. The minimalist approach in this context reverses the open-plan logic: instead of removing boundaries, it establishes precise territorial definitions within a single room through furniture placement and lighting.
References and further reading
The Polish building regulation document "Warunki Techniczne, jakim powinny odpowiadać budynki i ich usytuowanie" (Dz.U. 2002 Nr 75 poz. 690 with subsequent amendments) specifies dimensional standards for residential spaces in Poland. The Institute of Urban and Regional Development (Instytut Rozwoju Miast i Regionów) at irmir.pl publishes research on Polish housing stock conditions. For the architectural history of wielka płyta construction, the documentation maintained by the Museum of Architecture in Wrocław covers the principal Polish panel-building systems and their structural properties.