Design story

Birza Chair: thinking in one continuous sheet

Imagine beginning a chair with a sheet rather than a pile of wooden rails. The difficult question moves: instead of joining many members, the designer must make one surface turn into a place to sit and a way to reach the floor.

Written and reviewed by PatinaHall2 minutes readPublished 23 October 2026

Interpretive dark brown fibre-sheet armchair with a curved seat and back, curled arm edges, open sides and broad tapering sheet supports. — PatinaHall editorial reconstruction. It is not a documentary photograph. A reconstruction of the formed-sheet idea. Curves, openings and broad supports show the different tasks a surface can take on; they do not document the exact forming process.

On this page

Key facts & takeaways

At a glance

Subject: Birza Chair
Entry: Design story
Last reviewed: 23 October 2026
Designed: 1927documented

Three things to remember

The foundation records the Birza Chair design in 1927.
Its account describes a chair made from a single piece of fibre.
Centraal Museum 430 A 001 records a drawing of the design.

A different starting material

Rietveld’s familiar wooden furniture makes separate parts easy to notice. The Birza Chair starts a different conversation. The foundation dates it to 1927 and describes a chair made from a single piece of fibre.¹

A continuous sheet makes the eye follow a surface through several jobs. A seat must turn towards a back; the body needs openings and support. Form is no longer simply the visible result of placing rails beside panels. The material’s bends become part of the argument.

A drawing is also a working question

Centraal Museum preserves a furniture drawing titled Stoel uit één stuk (Birza stoel), catalogued to 1927. Its medium is ink and pencil on transparent material. The small archival object records the thinking about a chair, rather than being a miniature description of a production line.²

That difference is useful. A drawing can carry an ambitious proposal even while the practical work of shaping and retaining the form remains demanding. The attraction lies in seeing a familiar object approached from another direction.

A pale rectangular sheet is linked to an abstract curved chair-like outline, showing a change from flat material to spatial form. — Original PatinaHall schematic, not to scale. A flat field becomes a sequence of curved supporting and contact surfaces. The drawing explains the change of design question from assembling members to shaping a sheet; it is not a cutting pattern or a forming sequence.

An experiment that belongs to a longer search

The Louis Kalff Instituut places Rietveld’s research into one-piece chairs within his broader interest in materials and industrial production. It also quotes a 1958 Goed Wonen account describing repeated attempts, including outcomes that were unstable or uncomfortable.³

The Birza idea becomes more interesting in that company. Ingenuity includes the decision to keep investigating. A continuous surface offers a fresh question, without making the answer automatic.

Research notesEvidence, connections and limits

The foundation dates the design to 1927 and describes a single piece of fibre. Centraal Museum 430 A 001 is an ink-and-pencil furniture drawing, not a chair or evidence of a production series.

Evidence map

Connected subjects and evidence

Reviewed facts

Designed 1927documented
The foundation dates the design to 1927 and describes a single piece of fibre. Centraal Museum 430 A 001 is an ink-and-pencil furniture drawing, not a chair or evidence of a production series.
Reviewed 23 October 2026 by PatinaHall editorial.
- Source 1Schröder Small Table, 1923; Birza Chair, 1927

Reviewed connections

Birza Chairdesigned byGerrit Rietvelddocumented
The cited primary or institutional record identifies this designer for the repeatable model or coherent project family. A design credit does not identify the manufacture of every example.
Reviewed 23 October 2026 by PatinaHall editorial.
- Source 1Schröder Small Table, 1923; Birza Chair, 1927
Birza Chairuses materialFibre sheet recorded for the Birza Chairdocumented
The foundation dates the design to 1927 and describes a single piece of fibre. Centraal Museum 430 A 001 is an ink-and-pencil furniture drawing, not a chair or evidence of a production series.
Reviewed 23 October 2026 by PatinaHall editorial.
- Source 1Schröder Small Table, 1923; Birza Chair, 1927

Research trail

Sources and further reading

Furniture: Schröder Small Table and Birza ChairRietveld StichtingAccessed 23 October 2026
Stoel uit één stuk (Birza stoel), drawing 430 A 001Centraal Museum UtrechtAccessed 23 October 2026
Gerrit Rietveld: research into one-piece chairsLouis Kalff InstituutAccessed 23 October 2026