caption: The image shows a large yellow sponge on the bottom of a coral reef, surrounded by a variety of colorful corals. The sponge is a bright yellow color, and its texture is bumpy and bumpy. It is situated in the center of the reef, with the coral reef stretching out around it. The colors of the corals range from bright pinks and purples to deep blues and greens, creating a vibrant and eye-catching scene.