The crowded line of masons with trowels in their right hands, rapidly laying the long sidewall, The flexible rise and fall of backs, the continual click of the trowels striking the bricks, The bricks, one after another, each laid so workmanlike in its place, and set with a knock of the trowel-handle. Walt WhitmanSong of the Broad-Axe. Pt. III. St. 4.