A white fish swallows another, then gets swallowed in turn, the cycle collapses all hierarchy into appetite. Ghibli takes three minutes to ask what you thought was permanent and proves it's just food waiting for a bigger mouth. The smallest gesture of animation carries the weight of everything, because there is nothing else to hide behind.
Sakana no Sakana is an animated short made for the Ghibli Museum in Mitaka as part of its Film Guru Guru program. A little white fish swims into view and is swallowed by a bigger fish, which is then swallowed by a bigger one still, and so on up the chain. Finally a single enormous white fish is left. It appears to grow smaller as it heads toward the bottom of the screen, passes out of view, and the whole loop begins again.