If you want to make an optical tracing board at home, you'll need a few materials. First, you'll need a large piece of white poster board. You'll also need a black Sharpie or other permanent marker. Finally, you'll need a small LED light.
To begin, cut the poster board into any shape you like. Then use the Sharpie to draw lines, shapes, or patterns on the poster board. When you're finished drawing, turn off the lights in your room and turn on the LED light. Shine the light onto your drawing and watch as the lines and shapes glow!