A more thorough explanation:

in suo genere

When something is described as "in suo genere," it means that it is unique and unlike anything else. This phrase is often used to describe certain writings that are considered important even though they don't follow all the usual rules.

• A book that combines poetry and prose in a new way could be described as "in suo genere."
• A painting that uses unusual materials or techniques might also be considered "in suo genere."

These examples illustrate how "in suo genere" is used to describe something that is one-of-a-kind and doesn't fit neatly into any existing categories. Even though these works might not follow all the usual rules, they are still considered important and valuable because of their uniqueness.