What are the characteristics of poetry in expressing emotions?

The poet lived in the late Tang Dynasty. At this time, the Tang Dynasty was in full decline. The prosperity of the past is gone forever, like a dream, and it has been replaced by the chaos of the people. Poets look back on the past of the Six Dynasties by hanging on the historical sites of Taicheng, and today people regard the past as the future. The fate of the Six Dynasties, which flourished first and then declined, reminds poets of the Tang Dynasty, cherishing the past and hurting the present.

However, the prosperity of the Six Dynasties passed away like a dream, but the willows in Taicheng still flourish every spring. No matter the vicissitudes of life and the rise and fall of dynasties, it always gives people a sense of prosperity. It is in sharp contrast with the desolation and ruin of Taicheng, the eternal prosperity and the fleeting dream of the Six Dynasties. So the poet called it "heartless".

Original poem:

Taicheng

Wei Zhuang

The rain is falling, the grass is falling, and the birds of the Six Dynasties are singing.

Ruthlessness is a willow in Taicheng, but it is still a smoke cage.