Windmills are a cultural symbol exclusive to the Netherlands, representing the 16th generation of the country-The economic development of the 18th century was of great significance, as raw materials from all over the world were transported by waterways to the Netherlands for processing using windmills, such as Nordic wood, German hemp and flaxseed, cinnamon and pepper from India and Southeast Asia, and so on. Since its development, Dutch windmills have gradually become a cultural standard in the Netherlands, earning the country the nickname "Kingdom of Windmills".