Aerial view of the Open Chapel in Hillerhausen, Germany, featuring twelve sandstone columns on a green hilltop surrounded by forests and fields.

Open Chapel: Rethinking Space and Openness

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Context and General Concept

The “Open Chapel” in Hellerhausen, Germany, stands as an architectural example grounded in the concept of openness and the reconfiguration of spatial perception. The design draws inspiration from what are known as “Places of the Open Mind” in the nearby village of Referinghausen in the Sauerland region, where the project is tied to the idea of creating a space that enables both individual contemplation and collective connection at the same time.

Formation Process and Community Participation

The building’s design emerged from a participatory process involving local residents, allowing the project to reflect a collective approach to architectural production. Each participant contributed their expertise and perspective, resulting in a structure that does not express a singular vision, but rather embodies a multiplicity of viewpoints within the community.

A community gathering outside the Open Chapel in Hillerhausen with people sitting on benches during a public event.
The Open Chapel serves as a spatial outcome of collective production, hosting community events that reflect its participatory design origins. (Image © Thomas Mayer)
Close-up of vertical sandstone columns of the Open Chapel with a gravel path leading towards the structure.
Precise arrangements of 6-meter-high sandstone columns create a visual frame that connects the interior with the natural scenery. (Image © Thomas Mayer)

Architectural Significance

The architectural concept that links space to its social dimension, where its role is not limited to a religious or spatial function alone, but extends to fostering a shared experience. As a result, the building becomes an open environment for interaction and contemplation, reflecting the diversity of values and perceptions within the local community.

Site and Architectural Composition

The structure is situated on an elevated hill and consists of twelve sandstone pillars, each standing 6 meters tall, defining an open space. The arrangement of these pillars creates a visual framework that connects the interior with the surrounding architectural space and its environment.

A group of visitors listening to a presentation inside the Open Chapel under a vegetated roof structure.
Users experiencing the open-air structure, where the lack of enclosure supports a sense of inclusion within the social context. (Image © Thomas Mayer)
Symmetric view of lighted niches in the sandstone walls of the Open Chapel overlooking the misty valley.
The deliberate positioning of the columns offers unobstructed views of the misty Sauerland valley, reinforcing the link between the mind and the horizon. (Image © Thomas Mayer)
Night view of the Open Chapel with warm interior lighting illuminating the sandstone niches and wooden benches.
Warm artificial lighting accentuates the symbolic “cupped hands” formation of the structure, creating a peaceful atmosphere for evening reflection. (Image © Thomas Mayer)

Spatial Organization and Experience

The interior space is characterized by a semi-symbolic configuration resembling two protective hands. This openness allows the space to be used for both individual and collective contemplation, with the possibility of engaging with others or with nature. The structure also contributes to fostering a sense of integration within the surrounding social context.

Material Elements and the Boundary Between Nature and Architecture

The seating arrangement encourages direct interaction and dialogue within the space, while the vegetation-covered roof blurs the boundaries between the building and nature. Additionally, the woodchip-covered flooring provides a gradual transition between the interior and the external environment, highlighting the integration of building materials with the natural setting into a cohesive whole. The surrounding architectural elements reinforce this relationship.

Interior view of the Open Chapel showing wooden seating niches within sandstone pillars and wood chip flooring.
The interior organization features semi-symbolic seating arrangements that encourage individual contemplation and direct dialogue. (Image © Thomas Mayer)
A group of visitors listening to a presentation inside the Open Chapel under a vegetated roof structure.
Users experiencing the open-air structure, where the lack of enclosure supports a sense of inclusion within the social context. (Image © Thomas Mayer)
Top-down aerial view of the Open Chapel showing the fish-shaped arrangement of columns and the green roof.
A top-down view revealing the symbolic configuration of the twelve elements, which creates a protective yet open enclosure. (Image © Thomas Mayer)

✦ ArchUp Editorial Insight

The Open Chapel in Hellerhausen operates as a spatial outcome of a locally driven civic funding mechanism and participatory governance, rather than as a conventional architectural project. Its primary impetus emerges from the logic of local crowdfunding and municipal land-use permissions that favor low-programmed, low-enclosure public structures. Regulatory constraints are reflected in structural safety requirements for freestanding stone elements, risk liability associated with the elevated site, and material supply limitations tied to the standardization of sandstone.

The final composition, twelve vertical elements defining an open space, represents a negotiated balance between ritual use requirements and public risk management frameworks. User flows are organized through peripheral seating and unobstructed visibility, while the relationship with nature is treated as a planning variable within the regulatory framework rather than as a symbolic value. The result is a form of spatial stability produced through the equilibrium between governance mechanisms and institutional constraints within the natural landscape, shaping the final project.


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