Non-polyhedra are three-dimensional shapes that do not consist of flat polygonal faces. Instead, they can have curved surfaces, like spheres or cylinders. These shapes are often found in nature and everyday objects, such as bubbles or balls, which do not have straight edges or vertices. Examples of non-polyhedra include cylinders, cones, and spheres. Unlike polyhedra, which are defined by their straight edges and vertices, non-polyhedra can be more complex in their structure. They play a significant role in various fields, including geometry, architecture, and art, where understanding their properties is essential.