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Brick compares favourably with stone as a structural material for its fire- and weather-resisting qualities and for the ease of production, transportation, and laying. The size of bricks is limited by the need for efficient drying, firing, and handling, but shapes, along with the techniques of bricklaying, have varied widely throughout history. Special shapes can be produced by molding to meet particular structural or expressive requirements (for example, wedge-shaped bricks are sometimes employed in arch construction and bricks with rounded faces in columns). Bricks may be used in construction only in conjunction with mortar, since the unit is too small, ...(100 of 24717 words)