Why do ordinary photos become classics?

Ordinary photos become classics for the following reasons:

Photography has the value of bearing history and is easy to understand. This surreal photography and anti-epidemic works can reflect the historical background of a specific time and place. For example, Jie Hailong's "Big Eyes" happened in the background of the huge gap between urban and rural education. The anti-epidemic work took place at a tense moment when the COVID-19 epidemic broke out suddenly in Wuhan, and a large number of medical staff from other provinces rushed to Wuhan and Wuhan was blocked. Because some photos were taken in a specific period, it is difficult to copy the historical value they bear. I can't make a second picture of such a work as Sunset Afterglow. Why? Because it was only taken during the anti-epidemic period in Wuhan, now this period of history has passed, and even imitation and makeup are difficult to restore the meaning at that time.