A deep sea octopus making shapes.
Octopods like this have long, fleshy spikes known as cirri lining their arms. It’s thought they’re used to create a current which draws copepods to the mouth.
There are a whole bunch of deep sea octopods with mantle fins and cirri, all belonging to a suborder called cirrata. Few are as colourful as this one, though!
Space☆Dandy ep.9: 「植物だって生きてるじゃんよ」 (Plants Are Living Things, Too, Baby)