Artefact story

Bronto prototype: a chair lets the mould improvise

A mould can repeat a shape while leaving room for a changing surface. Richard Hutten’s Bronto experiment uses that possibility: the chair keeps a recognisable form, while two plastic types create patterns that do not settle into an identical arrangement each time.

A rounded chair-like plastic form carries irregular blue and cream marbling across its exterior.
PatinaHall editorial reconstruction. It is not a documentary photograph. A repeated-looking outline and a variable-looking surface share the same chair form. The colours and exterior are interpretive; no prototype interior, exact pattern or tested performance is shown.
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Key facts & takeaways

At a glance

Subject
Bronto prototype, Centraal Museum 28498
Entry
Artefact story
Last reviewed
26 October 2026
Object dated
1997documented

Three things to remember

  1. The museum subject is the 1997 prototype 28498.
  2. Hutten’s process account names two different plastic types.
  3. A repeated outline can coexist with a variable surface pattern.

A chair with a process inside its appearance

Bronto makes a production question visible at the surface. The chair can retain an overall form while allowing the meeting of its materials to vary from one outcome to another.

Centraal Museum’s object 28498 is specifically a prototype dated 1997 and credited to Richard Hutten. That identity anchors the account to one physical experiment rather than a whole later commercial family.1

Hutten’s studio describes seeking furniture that would not be assembled from an ordinary collection of constructed parts. Its account explains his move towards rotational moulding and the machine he made for the experiment.2

The machine belongs to the story because it opened a different kind of design decision: how much should be determined by the outline, and how much could be left to the way materials moved in the mould?

The repeated form keeps a changing surface

The studio describes two plastic types, one more rubber-like and one harder. It connects the pattern outside with rotation inside the mould and says the resulting arrangement cannot be controlled into an identical repeat.2

That gives the surface a record of process. The outline can remain recognisable while the colour areas and transitions vary, so repetition and difference are present in the same object.

The museum’s process account provides a more particular description of its prototype, including the partly rigid contribution of harder plastic. This remains the authority for that object’s material structure.1

Looking at the surface is therefore more than noticing a decorative pattern. It offers a clue to a method in which the materials’ encounter helps decide what each example will look like.

Three similar rounded silhouettes have different green and warm surface patches.
An outline can repeat while a surface pattern differs. These are illustrative variations, without a prototype count, an interior cutaway or an exact moulding recipe. Original PatinaHall schematic, not to scale.

The prototype keeps the question open

The studio’s model entry is headed 1996 and goes on to describe later Gispen furniture. The museum prototype has its own 1997 date. Keeping those stages legible allows the experimental object to retain its particular role.12

A prototype can hold a question especially clearly. Here it asks whether a chair must be completely predictable to be designed.

Bronto’s answer is visible in the balance between a recognisable form and a surface with room to differ. The repeated shape gives the experiment a frame; the materials keep something of their own movement within it.

Research notesEvidence, connections and limits

The studio’s 1996 model heading and its later Gispen family account are distinct from the 1997 prototype. The museum describes a partly rigid harder-plastic core; no continuous inner liner, exact recipe or tested child/load performance is inferred.

Evidence map

Connected subjects and evidence

Reviewed facts

  • Object dated 1997documented

    Centraal Museum dates its exact Bronto prototype 28498 to 1997; this is not a universal date for every example of the design.

    Reviewed 26 October 2026 by PatinaHall editorial.
    • Source 1Prototype object record; Dating 1997; material/process account

Reviewed connections

  • Bronto prototype, Centraal Museum 28498attributed toRichard Huttenattributed

    Centraal Museum credits Richard Hutten for prototype 28498. The studio’s 1996 model entry and later Gispen family remain distinct from this 1997 prototype.

    Reviewed 26 October 2026 by PatinaHall editorial.
    • Source 1Prototype object record; Dating 1997; material/process account
    • Source 21996 heading; two-plastic rotational-moulding and later Gispen paragraphs 12–13
  • Bronto prototype, Centraal Museum 28498uses techniqueRotational colour variation in the Bronto prototypedocumented

    The studio describes two plastic types and rotational moulding with variable surface patterns. This account does not identify a manufacturer for the exact museum prototype or establish tested child/load safety.

    Reviewed 26 October 2026 by PatinaHall editorial.
    • Source 1Prototype object record; Dating 1997; material/process account
    • Source 21996 heading; two-plastic rotational-moulding and later Gispen paragraphs 12–13

Research trail

Sources and further reading

  1. Bronto prototype, object 28498Centraal Museum UtrechtAccessed 26 October 2026
  2. Bronto Childrenschair—GispenRichard Hutten StudioAccessed 26 October 2026

Last reviewed 26 October 2026. Found an error or a stronger primary source? Contact PatinaHall.