Floating castle concrete project on Eindhoven river, showcasing innovative materials and eco-friendly design.

Yvonne Mak’s Eco-Friendly Floating Castle Reinvents Concrete on Eindhoven’s River

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Written by Seth Sebastian

2026-10-21

Visual artist Yvonne Mak presents a remarkable installation, “Sandbag Castle,” designed to address the environmental impact of traditional cement while exploring the innovative use of floating castle concrete. Situated in the Dommel River adjacent to Eindhoven’s Van Abbemuseum Café, this structure spans five meters in width and three meters in height. Composed of hundreds of stacked, sandbag-shaped concrete forms, the installation mimics the architectural features of a castle.

Large concrete installation beside Van Abbemuseum Café in Eindhoven, blending with the riverside scenery.
the five-meter-wide, three-meter-high installation situated beside the Van Abbemuseum Café in Eindhoven

Floating Castle Concrete: Sandbags and Warning Flags

The artwork incorporates numerous design elements that communicate both structural and environmental themes. The sandbag-shaped modules, crafted from concrete, evoke temporary flood barriers, underlining the dependence on this innovative material in protective infrastructure. Atop the castle, red warning flags echo beach safety signals. These flags are embellished with a bespoke coat of arms symbolizing water, bridges, flora, and hands, highlighting the interaction between nature, infrastructure, and human influence.

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Curved concrete modules in stacked sandbag formation, emphasizing innovative structural design.
hundreds of concrete modules shaped to resemble stacked sandbags

Integration of Ten Innovative Low-Carbon Building Formulations

The project physically embodies over ten distinctive low-carbon floating castle concrete variants, including calcined clay, alternative binders, geopolymer concrete, recycled aggregates, and self-healing concrete. Developed in collaboration with main partner TBI and expert material and technology contributors, “Sandbag Castle” showcases both current and emerging structural alternatives aimed at curbing the CO₂ emissions associated with concrete construction. Utilizing these eco-friendly solutions contributes to sustainable concrete initiatives.

Concrete structure highlighting eco-friendly material use in a purpose-driven aesthetic.
a concrete installation designed to showcase low-carbon material alternatives
Concrete shapes evoke temporary flood barriers, indicating flexible usage in construction.
concrete sandbag forms referencing temporary flood protection barriers
Colorful flags above installation convey beach safety signals atop the concrete configuration.
flags referencing beach safety warnings elevated above the installation
Distinct low-carbon concrete mixes form a cohesive, sustainable structure.
the installation integrates over ten distinct low-carbon concrete formulations
Building innovations targeting reduced carbon dioxide output in the construction industry.
material innovations designed to reduce CO₂ emissions in construction
Floating castle concrete project on Eindhoven river, showcasing innovative materials and eco-friendly design.

Source: designboom.com

Frequently asked questions

What is Yvonne Mak’s “Sandbag Castle” installation?

“Sandbag Castle” is an installation by visual artist Yvonne Mak designed to address the environmental impact of traditional cement using floating castle concrete. It is situated in the Dommel River near Eindhoven’s Van Abbemuseum Café and is composed of stacked, sandbag-shaped concrete forms mimicking a castle.

What are the design elements of the Sandbag Castle?

The installation includes sandbag-shaped modules crafted from concrete to evoke temporary flood barriers and red warning flags atop the castle. These flags are embellished with a coat of arms symbolizing water, bridges, flora, and hands.

Which eco-friendly concrete variants are used in Sandbag Castle?

The Sandbag Castle incorporates over ten low-carbon floating castle concrete variants, such as calcined clay, alternative binders, geopolymer concrete, recycled aggregates, and self-healing concrete.

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