Designing outdoor furniture that manipulates sound using metamaterials is an innovative approach to enhancing acoustic experiences in open spaces. Metamaterials, engineered to control sound waves, can be integrated into furniture designs to absorb, reflect, or diffuse noise creatively.

Start by selecting lightweight, weather-resistant metamaterials with precise acoustic properties. These materials can be structured to target specific frequencies, reducing unwanted noise while amplifying desired sounds. For example, a perforated metal table base could scatter high-frequency sounds, while a porous concrete bench might absorb low-frequency rumbles.

Incorporate these materials into functional furniture pieces like benches, partitions, or overhead pergolas. The key is balancing aesthetics with acoustic performance—experiment with geometric patterns or layered designs that double as sound filters.

Testing prototypes in real outdoor environments is crucial. Measure how wind, temperature, and humidity affect the metamaterials' performance, and iterate for optimal results. This fusion of design and acoustic engineering creates outdoor spaces that are both visually striking and sonically refined.

By leveraging metamaterials, designers can transform ordinary outdoor furniture into intelligent sound-modulating installations, redefining how we experience open-air environments.