A sushi chef prepares makizushi, or a sushi roll. The plates in the foreground of the picture are on a conveyor belt that carts the fish and rice treats around the restaurant. If you want one, you grab it. Different colored plates indicate different prices.
If you don't like what's on the conveyor belt, you can order other items from the chef. This is a delicious tuna roll I requested.
A fellow diner receives nigiri he ordered from the chef. Instead of fish rolled in rice, nigiri is made by forming a clump of rice and pressing the fish on top.