Glow-in-the-dark paintings are artworks that contain special pigments, allowing them to emit light in the dark after being exposed to a light source. These pigments absorb light energy and release it slowly, creating a glowing effect. Typically, these paintings are created using phosphorescent materials, which can be applied to various surfaces, including canvas and walls. They are popular for decorative purposes, especially in children's rooms or themed spaces, as they add a whimsical touch and can create a calming atmosphere at night.