A hemispherical roof is a type of roof that is curved and shaped like half of a sphere. It is also known as a DOMED roof, which is made up of a single curved surface that is supported by a structure around its circumference. The DOME shape is created by using a technique called peening, which involves hammering the metal into a curved shape. Igloos are an example of a structure with a hemispherical roof, as well as the mabe pearl, which is a type of pearl that is formed in a hemispherical shape.