Design story

Tonus: a wooden stool with a muscular outline

Tonus looks less like a collection of chair parts than a body holding a pose. In the wooden version, Aldo Bakker lets swelling and narrowing volumes carry the idea of support. The oak remains plainly present, while the usual boundaries between seat and legs become harder to point out.

Rounded wooden stool interpretation with broad transitions between its top and supports.
PatinaHall editorial reconstruction. It is not a documentary photograph. Rounded transitions make the wooden body read as a continuous volume.
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Key facts & takeaways

At a glance

Subject
Tonus wooden stool
Entry
Design story
Last reviewed
26 October 2026
Designed
2011documented

Three things to remember

  1. The selected Tonus is the solid-oak version.
  2. The studio names Rutger Graas as its producer.
  3. Rounded transitions make support read through mass rather than a list of separate parts.

Wood begins to look muscular

A conventional stool often introduces itself in parts: a top, supports, perhaps a rail joining them. Tonus asks the eye to follow a continuous volume instead. Its bulges and narrower passages suggest tension and relaxation, even while the material remains wood.

Bakker’s studio identifies the 2011 wooden design as solid oak and gives a compact 540 × 360 × 340 mm specification. It also names Rutger Graas as producer. These fields bring a deliberately unusual form back into the concrete world of a material, dimensions and a maker.1

The muscular reading is useful because it describes a relationship between shapes. A broad volume seems to gather strength before it narrows.

A junction becomes a transition

With separate pieces, the eye can stop at a meeting: this rail ends here; that support begins there. A rounded transition encourages it to keep moving. The surface carries the change of direction without making the boundary its main event.

That changes how the stool occupies a room. It can be recognised as a small seat, but it also reads as a volume with its own posture. The spaces around and below it become part of understanding the mass.

Oak adds another layer to that reading. Its visible grain belongs to timber, while the outline invites comparison with a body. The interest lies in seeing both at once, without having to settle on only one association.

Separate parts and a continuous rounded transition offer two ways to read a wooden volume.
Separate parts and a continuous rounded transition offer two ways to read a wooden volume. Original PatinaHall schematic, not to scale.

The designer does not erase the maker

Homo Faber’s account of the Tonus Family identifies Rutger Graas as the craftsperson and describes wax-finished oak stools with an animal-like, muscular impression. It separately credits the design to Bakker.2

That division is worth keeping visible. The continuity one sees in the object does not mean that conception and making are the same task. A highly particular surface still has to be realised in a particular material by someone with the necessary skill.

Particles Gallery’s catalogue lists wooden, bronze and urushi Tonus works separately. The recurring name therefore leads to a family of material decisions, rather than giving permission to describe every version as if it were identical.3

A small pause before sitting

Tonus offers a simple change in the way to look at furniture. Instead of counting the parts first, follow where the volume thickens, turns and thins. Then notice how the timber’s character remains visible through that movement.

The seat’s use is familiar. Its form makes recognition take a little longer, and that short pause gives the wood and the making room to be noticed.

Research notesEvidence, connections and limits

The wooden Tonus and the oak craft account are the subjects here. Bronze and urushi versions have separate materials and making histories; their properties are not transferred to this stool.

Evidence map

Connected subjects and evidence

Reviewed facts

  • Designed 2011documented

    Aldo Bakker’s studio dates the wooden Tonus to 2011. The record specifies solid oak and names Rutger Graas as producer. Bronze and urushi versions have their own material and production histories.

    Reviewed 26 October 2026 by PatinaHall editorial.
    • Source 1Work or object record and accompanying maker account: Tonus wooden stool. Tonus

Reviewed connections

  • Tonus wooden stooldesigned byAldo Bakkerdocumented

    The studio record identifies Aldo Bakker as the designer of the wooden Tonus. The muscular reading of its rounded form is an interpretation supported by the separate Homo Faber craft account, rather than a structural or anatomical claim.

    Reviewed 26 October 2026 by PatinaHall editorial.
    • Source 1Work or object record and accompanying maker account: Tonus wooden stool. Tonus
    • Source 2Tonus Family craft record: muscular oak stools, wax finish, design Aldo Bakker and maker Rutger Graas
  • Tonus wooden stoolmanufactured byRutger Graasdocumented

    The studio names Rutger Graas as producer, and Homo Faber identifies him as the maker of the oak Tonus Family. The wax-finished family described there must not be silently equated with every Tonus edition.

    Reviewed 26 October 2026 by PatinaHall editorial.
    • Source 1Work or object record and accompanying maker account: Tonus wooden stool. Tonus
    • Source 2Work or object record and accompanying maker account: Tonus wooden stool. Tonus Family

Research trail

Sources and further reading

  1. TonusAldo Bakker StudioAccessed 26 October 2026
  2. Tonus FamilyHomo Faber / Michelangelo FoundationAccessed 26 October 2026
  3. Aldo Bakker and represented workParticles GalleryAccessed 26 October 2026

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