When these Christmas stars begin to shine at home, it's always worth a closer look. Because what appear to be bulbous spheres from afar turn out to be 2Dcompact discs! the optical illusion works as well in Christmas trees as it does as a window decoration or eye-catching gift tag. What's more, stars’ unbreakability will ensure that it survives countless winters unharmed, however boisterous a holiday bash might be.