Introduction to the fourth hall: The fourth hall is "Shouba Spring and Autumn" and is divided into two parts. The first is to show Huan Guan's measures to implement economic reforms and enrich the country and strengthen the army; the second is to describe Guan Zhong's great achievements in using the banner of respecting the king and resisting barbarians, uniting the nine princes, ruling the world, and finally achieving hegemony. The panoramic canopy and scenery box in the hall depict the scene of "equalizing the land, dividing the land, and conquering the land"; the model sand table reproduces the prosperous scene of the capital of the ancient Qi State, where people lived in separate industries and specialized in salt and iron. There are many salt-making and iron-smelting workshops, the people are well-fed, the economy is prosperous, and it is called the "Venice of the East".