angles beams blue-collar-workers brick-work Bricklayer builders building carpenters clothing concrete construction construction-work construction-workers dangerous dangers fabric footwear foreman form-work garment height high longyi lumber multi-storey multi-story roofer roofing safety scaffolding standards structure timber tools tradesmen unprotected wood wood-work wooden work workman abstract architectural background barrier basic brick brick-wall bricks brickwork building-material colored coloring colors coloured colouring colours composite constructed distinctive exterior external firm linear lines mortar old perspective perspectives rectangles rough secure security solid standard strength strong style surface surfaces symmetry texture textured textures uneven varied various wall backdrop cement rectangular smooth surfaced traditional-brick-wall variation walled wallpaper well-built