> A lot of people are freaking out because the head is up This is very very cool. Not only is the internal shell of the spirula [0] a wonderful link between th

> A lot of people are freaking out because the head is up This is very very cool. Not only is the internal shell of the spirula [0] a wonderful link between the nautilus shell [1] and the cuttlefish's cuttlebone [2] but the orientation at depth is backwards from what is observed at the surface in aquariums. [0] https://en.wikipedia.org/wiki/Spirula#Shell https://en.wikipedia.org/wiki/Spirula#Shell [1] https://en.wikipedia.org/wiki/Nautilus#Shell https://en.wikipedia.org/wiki/Nautilus#Shell [2] https://en.wikipedia.org/wiki/Cuttlebone https://en.wikipedia.org/wiki/Cuttlebone