Some 3D shapes, like cubes and pyramids, can be opened or unfolded along their edges to create a flat shape. The unfolded shape is called the net of the solid. Here are some 3D shapes and their nets.

The idea for the project all began when Ben Davis, a 6th-grade modeling and design teacher, saw 2-year-old Emmett Hightshoe and her family at Greg Olsen’s The Heartest Yard 5K.