Outdoor sculptures are increasingly embracing algae-based materials as a sustainable alternative to traditional mediums. These biodegradable and eco-friendly materials offer unique textures, vibrant colors, and minimal environmental impact. Artists mix algae with natural binders like starch or clay to create durable yet compostable structures. Some sculptures even incorporate living algae, which grow and change over time, adding a dynamic element to public art. Beyond aesthetics, algae-based sculptures absorb CO2, contributing to urban air purification. This innovative approach merges art with environmental stewardship, inspiring communities to rethink sustainability in creative ways.