Sounds like a playground for a light sculptor, but remember a hallway is a rectangle in 3D space, so if you start messing with the curvature of light you’ll need to map the normal map first, or you’ll end up with a portal that looks like a glitch and not a mood. Think about the color temperature you want—warm for comfort, cool for tension—and how the shadows will shift as people walk past. It’s doable, just keep an eye on the light bleed, or you’ll have a walking, breathing shadow that’s actually a ghost.