Design an artistic and whimsical sofa inspired by a colorful, inflated balloon. The sofa should have a playful, rounded shape that mimics the curves and buoyancy of a balloon. Use a vibrant and varied color palette, with bold and contrasting hues to evoke a sense of joy and creativity. The materials should have a glossy, reflective finish to capture the light and enhance the balloon-like quality. Incorporate unique and artistic details, such as subtle patterns or textures that add depth and interest. Ensure the overall design is both comfortable and visually striking, creating a piece that stands out as a functional work of art, dark back ground