What is unique about sushi?

Could you elaborate on what sets sushi apart from other culinary delights? What are the key characteristics that make it so distinct and sought-after by food enthusiasts worldwide? Are there any specific ingredients, preparation techniques, or cultural traditions associated with sushi that contribute to its uniqueness? Additionally, how does sushi's versatility and innovation in flavors and presentations continue to captivate audiences and shape its identity as a culinary art form?