Create a high-quality vertical split-screen cinematic poster with a glowing vertical divide down the middle. Left side (lighter, more vulnerable personality): James McAvoy as a soft, anxious, intellectual version of Kevin from the movie Split. Neat button-up shirt, gentle expression, warm lighting, slightly nervous but intelligent eyes, subtle time particles floating around him, clean minimalist background with faint clock faces. Right side (dark, intense personality): James McAvoy as the powerful, menacing "The Beast" alter from Split. Shirtless or torn clothing, muscular and primal pose, intense glowing eyes, dramatic dark lighting with strong shadows, cracked concrete and broken chains, raw powerful energy. Bold text at the bottom in fractured futuristic font: “Split — One Mind, Many Realities”. Ultra-detailed, photorealistic, cinematic color grading, moody thriller atmosphere, 8k quality.
