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To understand the practicality of round manhole covers, we must first look back at the history of urban engineering. The earliest manhole covers were not always round; in fact, they came in various shapes, including square and rectangular. However, these shapes posed significant challenges. For instance, square covers could be inserted diagonally into the opening, increasing the risk of them falling through and creating a hazard for pedestrians. This vulnerability prompted engineers to seek a more suitable design.

Furthermore, in modern cities facing rising sea levels and changing climate conditions, bollards also serve functional roles as barriers against flooding. They stand as sentinels for the future, reminding us of our past while reinforcing our commitment to protecting coastal areas.