The leading flat-earther theory holds that Earth is a disc with the Arctic Circle in the center and Antarctica, a 150-foot-tall wall of ice, around the rim. Flat-earthers believe photos of the globe are photoshopped GPS devices are rigged to make airplane pilots think they are flying in straight lines around a sphere when they are actually flying in circles above a disc. While writing off buckets of concrete evidence that Earth is spherical, they readily accept a list of propositions that some would call far-fetched. The belief that the Earth is flat has been described as the ultimate conspiracy theory.

Walking around on the planet's surface, it looks and feels flat, so they deem all evidence to the contrary, such as satellite photos of Earth as a sphere, to be fabrications of a 'round Earth conspiracy' orchestrated by NASA and other government agencies. Nowadays, members of the Flat Earth Society claim to believe the Earth is flat.

His theory follows from a mode of thought called the 'Zetetic Method,' an alternative to the scientific method in which sensory observations reign supreme. People do not see with, but in the eye, as if we are in a camera. He published the book ’Plea for the Flat Earth’ and challenged scientists to argue with him. One of the most famous advocates for the theory of the flat earth flat is the Dutchman Klaas Dijkstra (1895-1969).