Step 1: Use the cardboard to block out most of the light from the flashlight.The remainder of the light should make a recognizable shape, like a square, triangle or star.

• 步骤一：用厚纸板挡住手电筒大部分的光源，让剩下的部份变成可辨认的形状，例如：正方形、三角形或星形。