From here:
Blue Buttons are not true jellyfish, but are Chondrophores. These are actually colonies of polyps. In other words, they are like a tiny colony of animals. Each animal contributes something different to the colony. Some form the central disk, while others form the tentacles. Blue buttons exist in colonies, and mass beachings frequently occur since they are at the mercy of the wind and water currents. Blue buttons generally measure 1.5 inches across or less, and are generally dark blue or turquoise in color, although a lemon-yellow color variant sometimes occurs.Blue buttons, like the Portuguese Man of War, and the By-the-wind-sailor (velella velella), are not true jellyfish, although they are closely related. They are all in the same phylum (cnidaria).
Well, it looks cool.MP3: Michael Hurley - Blue Driver (Thx Justin)Because you're sweet and lovely, I love you.