A geodesic dome is a structure made of struts that are connected to approximate the shape of a sphere (or part of a sphere). Spaceship Earth at EPCOT in Walt Disney World, Florida, is a famous example of a geodesic dome that is a complete sphere shape.

Typically, the struts of a geodesic dome are joined together in triangles, with the points of the triangles being approximately on the sphere’s surface. The edges of the triangles form great circle-like shapes, or geodesics, over the surface of the dome. The struts form a rigid network that transmits stress forces throughout the structure.