Shakespeare wrote Sonnet 130 about the same "Dark Lady" as Sonnet 18, which we read on Block Day. But this poem is inverted (upside down). Instead of saying she is more lovely than a summer's day, he talks about how she's not as beautiful as the sun, coral, roses, perfume, etc.
He starts off by acknowledging that his mistress does not possess the traditional attributes of beauty that are often compared to in poetry. He describes her as having "dun" or dark-colored skin, wiry hair, and breath that reeks.
However, despite these unflattering descriptions, Shakespeare concludes the sonnet by stating that his love for her is genuine and real. He values her for who she truly is, rather than elevating her to an unattainable level of perfection.
In a way, Sonnet 130 challenges societal norms and expectations of beauty. It emphasizes the importance of seeing beyond physical appearance and appreciating a person for their inner qualities. It is a refreshing and honest depiction of love that goes beyond surface level attractions.