The Stone Foam Stool.

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Minimal . Lightweight . Beautiful.

The Stone Foam Stool by Matthijs Kok.


The Stone Foam Stool arose from Matthijs Kok‘s fascination for Installation Art. The perception, interaction and contradictions, characteristic of Installation Art are brought together in this stool. A stool with a hard look, which is unexpectedly soft.


After researching polyurethane material for several months, Matthijs developed a recipe to create Stone Foam. Adding clay grains, pigments and several other materials to two composites liquid polyurethane gives the expanded foam a raw basalt texture.

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To make the stool, a custom-made silicone mould of a negative of soapstone is filled with the Stone Foam mixture. The mixture inside the mould increases sixteen times in volume. During expanding, the stone foam takes over the soapstone shape of the mould. After de-moulding, the clay granules are soaked from the casting and hereafter the stone texture appears, perfect down to the last detail. In the last step of the production process, the casting is fine tuned with multiple grey shades for a more natural result and the chrome legs are attached to the seat.


The total weight of the stool in its final form is just 5% of the original stone, creating another contradiction as it’s lightweight and easy to move around the house. Material and design turn the Stone Foam Stool into an eye catcher – a real conversation starter and is a piece of functional modern art.


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