A wall constructed in glazed-headed Flemish bond brickwork pattern with different shades and lengths. Block is the same expression referring to an oblong building device composed of clay or concrete, but is generally more substantial than the usual brick. Lightweight bricks (also called lightweight blocks) are comprised of expanded clay https://byd46914.alltdesign.com/the-smart-trick-of-construction-that-no-one-is-discussing-55401167