The Leake Street Graffiti Tunnel in London is an ever-changing, immersive street art hotspot located beneath Waterloo Station. It is a legal graffiti wall, where artists from around the world constantly repaint its walls with colorful murals, intricate tags, and elaborate designs.

If you're referring to a 3D aspect of the tunnel, this could relate to the use of optical illusions, perspective-based graffiti, or augmented reality (AR) artwork that makes the walls appear to have depth beyond their physical limits. Some artists create trompe-l'œil effects, making their pieces look as if they are popping out of the walls or receding into them. The tunnel's dim lighting and rough, urban texture further enhance the depth and raw energy of these pieces.