In actual construction, the gabion is somewhat like a cage. The cage may be cylindrical or in the shape of a square or rectangular box. The cage may be constructed with a number of different materials, depending on the application. In some cases, the gabion is made with the use of metals, while gabion that are intended for temporary use may be composed of an outer shell of canvas or a similar material. Even wick has been used as the material of choice for a gabion.