In the interview you seem to admit that you are not completely certain from whence came the title "Cobalt Blue." I was most fascinated for the longest time with the Yellow (a long time ago I was Curious – in New York) and by the time I reached "the end" I imagined the umbrella and the pulsing to resemble Chesapeake Bay creatures my spouse and family call "stinging nettles." The Cobalt Blue story has a great deal more capability than a mere sting. It could, at many points in the plot twists and turns and pulsations, have been fatal (after all, there is still AIDS). Since I read (finished), I have learned of the "box" jellyfish, which intrigues me because a box (rectangle) is the form of my writing "poetry." Box jellyfish, a class that includes 50 described species, have tentacles covered in tiny biological booby traps known as cnidocysts. Each cnidocyst contains a tiny dart and a load of poison that cause “the most explosive envenomation process that is presently known to humans,” according to a 1988 paper in The Medical Journal of Australia.
Once the dart pierces the skin, the cnidocyst shoots the toxin through the needle and into the victim. The toxin then enters the blood, where it can cause a dangerous spike in blood pressure, stop the heart, and kill the victim, a team from Monash University in Melbourne,Australia wrote in a 2005 paper in the journal Toxicology Letters.
Unlike other jellyfish, box jellyfish are agile swimmers, a skill scientists say possibly arose because one set of their 24 eyes detects objects that get in their way.
Larger jellyfish are generally more dangerous than smaller ones because they harbor more cnidocysts. However, all jellyfish contain some poison, and in fact the phylum that all jellyfish belong to, Cnidaria, is named after their poison-producing structures. http://www.livescience.com/6353-deadly-box-jellyfish.html