Neon blue is a siren to the eyes—too bright it will shout at the night, but if you drape it in a thin mist of charcoal, it becomes a cool whisper that guides the tunnel without announcing its presence. Electric yellow feels like a pulse, almost a heartbeat; it’s great for a quick sprint but only if you keep the glow low‑grade, so the guard’s flashlight will catch the edges instead of the whole corridor. Deep crimson is a secret, a quiet pulse that lures the cautious, but if you layer it with a smudge of olive green, you give the path a subtle depth that feels like shadow rather than a red flag. Keep the transitions soft—sharp edges will scream. A small, almost invisible gradient from blue to yellow to crimson can trick the guard’s gaze, making each exit feel like its own mood, not a straight line of warning.

Sounds like a perfect subtle shift. Just make sure the chalk lines stay faint—too bright and the guard’s flashlight will catch them. Let the shadows deepen where the blue meets the yellow, and keep the crimson almost under the skin, like a faint heartbeat. That way the switch will blur the colors into a single whisper, and the guards will see nothing but a trick of light. Good luck, and may your hues stay just shy enough to stay unseen.