Heyo, now HERE'S a fun marble! This one is chock full of blue neon glow glass in the middle of it, with a pod pattern on the outside. When you hit this baby with light it starts glowing, peeking through the areas where there's no design. It's not like UV glass, which only reacts to black light, but instead it charges with regular light as well (and even faster with black light) and will keep on glowing even after the light is turned off! (Just don't use LED lights as I learned - for some reason it doesn't react well to LED.) Super fun marble to amaze your family and friends with!