The last major method of adobe construction is that of making sun-dried bricks. These bricks can be hand formed, but are normally made from rectangular molds. Nonetheless, it is still hard work, because the mud is set into the molds by hand. The bricks are left on the ground to dry in the sun. Once dry, they are then joined together by a mud mortar of the same composition as the bricks, making a unified mass, which is then covered by a mud plaster.