Now, what actually goes into one of these rolls? Who knows, we're talking marketing at this point, not production. Additionally, decorating would be easy too. Just take some public domain images of famous essentialists, Camus, Heidegger, Sartre, and Photoshop (well Gimp, I prefer open source) in some sushi! A simple but effective way to merge the two pillars of the endevor into a common image.
Speaking of Jean-Paul Sartre, there would have to be a nausea roll, but even with this strongly themed menu, that might not be a big seller. But it did remind me of a story I was told of an unfortunate attempt to get someone to try sushi for the first time which resulted in projectile vomiting. The story was told, ironicly enough, at a sushi restaurant, so maybe this idea of an existential sushi has been bubbling up through my subsconscious for a while now just waiting for the correct overt triggers.
So there it is, my idea for a restaurant should I ever want to give up on computer programming. No stealing!