Glow Wall

Draw with light on a wall that glows in the dark and watch your pictures slowly disappear. Discover the phenomenon of phosphorescence.

The Science Behind It

The wall is coated with a special material that can absorb and store light energy. When you shine light on the wall, particles in the material become excited and take in energy. After the light source is switched off, they slowly release that energy again as visible light. This delayed glow is called phosphorescence. Unlike fluorescence, which stops almost immediately, phosphorescence can continue for seconds or minutes. That is why your light trails remain visible briefly before fading away—an effect also found in glow-in-the-dark stars and clock hands.