Premium luxury architectural interior featuring a grand floating spiral staircase made of white marble and brushed brass, ascending through a soaring atrium with massive floor-to-ceiling windows, dramatic golden hour sunlight streaming through volumetric rays creating ethereal dust motes, soft cream and warm copper color palette, cinematic wide shot with atmospheric depth and perspective convergence, hand-painted gouache texture overlay with visible brushstrokes and paper grain, raytracing and global illumination rendering, professional architectural visualization style, ultra-detailed 3D render reinterpreted as traditional frame-by-frame animation