The use of concrete in construction is probably one of the main trademarks of 20th century architecture. Concrete is composed of a combination of materials which when mixed with water solidify into the shape of the container where it is poured in. In this sense, it is the container or the ‘moulds’ who rule the outcome. The reuse of molds for casting concrete is a technique used to replicate and control the production of concrete elements or buildings. Architects and designers have used/created diverse types of molds and casting techniques to explore the limits of the material.