create a stunning 3d rendering of a geometric tunnel with a series of nested square frames use a combination of sleek metallic silver and glossy white for the frames to give a modern and sophisticated appearance the ground should be a smooth dark gray marble reflecting gentle light the background is an ethereal gradient transitioning from soft grey at the bottom to a serene sky blue at the top evoking a sense of endless depth and tranquility ensure the lighting accentuates the rhythmic repetition of the frames casting subtle elongated shadows to enhance the sense of perspective and infinity architecture
