A playful sea otter floating on its back in a swaying kelp forest at golden hour, National Geographic quality wildlife art, floating on its back with a stone balanced on its chest preparing to crack open a shellfish, dense kelp fronds silhouetted against filtered sunlight, luxuriously thick dark brown fur with lighter undercoat visible, curious bright eyes reflecting the underwater glow, mood of intelligent marine mammalian playfulness and coastal ecosystem vitality, warm amber and deep forest green palette with dancing light rays, dramatic from above the water surface capturing the otter's unique tool-use behavior against the golden underwater world, shallow depth of field with colorful anemones and sea stars on the ocean floor in soft focus, cinematic composition