This fantastic glass paperweight glows at night because glass blowers mixed phosphorus powder with the melted glass when it was formed and phosphorus naturally glows in the dark. No special display lights are needed to "charge" this great jellyfish paperweight, just normal daylight inside your home is enough light for the phosphorus to absorb. Each fabulous paperweight is hand blown, each will vary just a bit from the picture shown however it will still be awesome! This makes your paperweight truly unique and one of a kind. This Hand Blown Glow-In-The-Dark Glass Jellyfish Paperweight will delight and amaze you for years in your home or office. The Jellyfish is made out of glass and is not a real jellyfish. Each one is individually hand blown and so slight differences will be noticed. Bubbles are always in hand blown glass like as they are an indication that it was hand blown and a result of the artisan's glass blowing technique. 6 color LED Light changing stand base or single White Color Stand Base can be bought in our store to set the jellyfish on. All Jellyfish paperweights have an optional LED light stand.