Imagine a sleek black background, perfectly highlighting the smooth surface of a floating crystal sphere. A delicate line wave, glowing with a soft gradient from electric blue to violet, gently flows through the center of the sphere, giving the impression of light refracting through its clear, polished surface. The wave distorts slightly as it passes through, creating subtle reflections and glimmers on the sphere, with faint light trails that ripple outwards. The contrast of the glowing wave and the dark background creates a striking, futuristic visual.