Outdoor sculptures often incorporate unconventional materials to achieve striking visual and tactile effects, and sponges are one such innovative choice. Artists use sponges in sculpting for their versatility, lightweight nature, and ability to create intricate textures. When coated with durable materials like resin or concrete, sponges can withstand outdoor elements while maintaining their porous, organic appearance.

Sponges are particularly useful for mimicking natural forms such as coral, foliage, or weathered stone. Their absorbent properties also allow for unique paint applications, resulting in gradient or mottled finishes. Some sculptors even embed sponges within larger structures to add depth and contrast.

Beyond aesthetics, sponges offer practical benefits. They are cost-effective, easy to carve, and can be combined with metals or ceramics for mixed-media pieces. This approach exemplifies how contemporary public art blends traditional craftsmanship with experimental materials to engage viewers in unexpected ways.