Lighting and shadow play a crucial role in creating stylish Halloween decor by adding depth, mood, and motion. Using softly glowing lanterns in jars or battery-operated candles inside plastic milk jugs produces warm, flickering light that casts eerie shadows onto walls and surrounding areas. Positioning light sources near paper bats or ghost figures generates dramatic silhouettes that mimic movement and raise visual interest. Gentle shadows and layered lighting contrast enhance the spooky atmosphere while keeping the overall look refined and cohesive. Incorporating motion through subtle breeze interaction with hanging sheets or wreath elements further enlivens your setup. Thoughtful lighting choices elevate simple DIY elements into memorable, cinematic home scenes perfect for Halloween nights.