itsy bitsy sushi

http://mdn.mainichi-msn.co.jp/waiwai/news//20061019p2g00m0dm034000c.html

The delicate little morsel is authentic sushi, but instead of a slather of raw fish slapped on top of a handful of rice, there's only a single, tiny grain of the Japanese staple used.

That leaves only enough room for the fish to no bigger than about 1 centimeter-by-2 centimeters at most

That sounds like reductio ad absurdum of the Katsu-style nigiri, where the fish is much much larger than the rice ball.

I prefer a bit bigger rice-to-fish ratio, with the mass of the rice 1-3X the fish. Texture, y'know.

And at the other end of the size spectrum:
http://www.theoriginalsushipillow.com/