Calligraphy is a unique art form based on Chinese characters. Change it to double negation

1. Two "No" continuous actions.

Calligraphy can't be a unique art category formed on the basis of Chinese characters.

2. Negative adverbs with "no"

Calligraphy cannot be a unique art category formed on the basis of Chinese characters.

3. Rhetorical questions with negative words.

How can calligraphy not be a unique art category formed on the basis of Chinese characters?