Cite this article
Horňák, J. (2026) ‘Plasticity of public space: Framework for spontaneous user-driven transformation’, Architecture Papers of the Faculty of Architecture and Design STU, 31(1), pp. 31-37. https://www.doi.org/10.2478/alfa-2026-0005
SUMMARY
Contemporary public spaces are increasingly defined by institutional over-regulation and digital displacement. Modern urban environments are often “pre-scripted,” leaving little room for spontaneous human intervention. This rigidity conflicts with the innate human drive to shape one’s surroundings—a need that persists from our evolutionary history but is now suppressed by specialists and bureaucratic maintenance regimes. While cities have introduced participatory mechanisms, these often remain top-down and limited in practice. In response, this article introduces the concept of spatial plasticity: the capacity of a public environment to absorb spontaneous, user-initiated physical and programmatic modifications without losing its essential functions or character.
The article utilises a dual methodological approach. First, it establishes a theoretical framework by translating the concept of plasticity from physics and art theory into urban studies. Second, it employs a “research-by-design” strand based on systematic interventions conducted between 2019 and 2026 across Slovak cities Bratislava, Košice, Poprad, and German city Berlin. These “live laboratories”—ranging from modified shopping carts to oversized games—tested how various urban conditions (historic centres, housing estates, and residual spaces) respond to user modifications, revealing both material limits and regulatory barriers.
The concept of spatial plasticity draws on the physical notion of plasticity—the ability of a material to undergo permanent deformation under external forces without structural failure—and the art-theoretical understanding of plastic form as mutable yet persistent (Bois, Krauss, Malabou). By analogy, plasticity of public space denotes a public environment’s capacity to absorb user-initiated physical and programmatic modifications across varying scales and timeframes, while maintaining its essential functions and recognisable character. In urban studies terms, it measures how far ordinary users—not just planners or institutions—can reshape spaces through spontaneous rearrangements, informal appropriations, or tactical interventions, provided material and immaterial conditions align to stabilise such transformations.
The article argues that while rural environments naturally satisfy the human need for “spatial agency” through private gardens and fences, dense cities create an acute deficit. Urban residents instinctively attempt to personalise ambiguous spaces, yet these behaviours are often criminalised or suppressed. Plasticity redistributes agency back to the citizen, transforming “spectators” into “co-authors.”
Case Studies: Snow and Front Gardens. Two emblematic cases illustrate plasticity in action: Snow creates a temporary, highly malleable layer that enables spontaneous interventions (igloos, slides) without formal planning. This results in an intensification of use during otherwise underactive seasons, proving that people naturally reshape their surroundings when conditions allow.
In apartment-dominated estates, residents appropriate land strips to create micro-laboratories of adaptation. These gardens foster neighbourhood identity and produce more spontaneous interactions. The 2025 Bratislava Front Garden Championships demonstrate how this bottom-up plasticity can be turned into a civic policy.
Plasticity allows for the systematic analysis of urban spaces by identifying natural/artificial, material/immaterial, spatial, and temporal dimensions, and demonstrates its value as both an analytical tool and a design principle. By observing these qualities, planners can identify “critical points” where spatial design and regulation either enable or suppress urban initiative.
The article distinguishes plasticity from related concepts like resilience, flexibility, and adaptability. While flexibility typically refers to pre-scripted, institutionally defined multi-use (e.g., a plaza programmed for a market), plasticity addresses unscripted, user-generated intervention. It moves the focus from who participates to what kind of spatial conditions make bottom-up action materially possible and sustainable.
The article concludes that urban vitality depends on the capacity of environments to absorb unscripted change. Plasticity reframes public space as a structured yet malleable medium. By supporting strategies like modularity, reversibility, and adaptive governance, designers can bridge the “mismatch” between rigid institutional frameworks and the everyday agency of residents. Ultimately, plasticity serves as an evaluative lens to ensure that the production of public space remains a collaborative, living process.