Light that shouldn't exist creates features on a person's shadow.
This trope covers any situation where features that should not be visible on someone's shadow appear as patches of light - typically a smile, or eyes. Frequently implies an otherworldly nature to the person casting the shadow; can be related to Living Shadow, but doesn't always match in either direction. Can imply The Shadow Knows. Contrast Black Cloak and In the Hood, where lit features may be visible floating in shadow, but really exist.