Contrary to all appearances, this is completely real. O.O
What you are looking at is the fluorescently stained muscles of a phoronid larva. (Phoronids are one of the zillion variations on “tentacled filter feeder sitting in a tube” nature has come up with. They are related to lamp shells.) I couldn’t care less about larval muscles – not even sure why I opened the paper – but that looks friggin’ awesome. And a bit psychedelic.