The flat Earth theory, which suggests Earth is a flat disc surrounded by an impassable ice wall, has resurfaced in recent years. Proponents reject gravity and claim Earth’s curvature is an illusion. Notable figures like Samuel Birley Rowbotham popularized the idea in the 19th century, challenging the scientific consensus. Rowbotham’s 1881 book, *Zetetic Astronomy*, remains influential in the movement’s history.