artisan at work boat Boatbuilding by hand Caulking experience fishing boat knowledege manual construction manual tools Shipwright texture Watertight wood wood texture wooden boat woodwork work build cement construct construction gravel industrial industry job labor labour landscaping manual project site wheel wheelbarrow worker architecture building immigrant laborer middle east plot street Syrian traditional activity fabricate factory grinder grinding light manufacturing metal occupation protection skill spark steel technician tool turning welder welding at beware blank blue caution council danger dig digging hazard information man men repair repairing road roadworks rope safety sign symbol triangle urban wall warning white works analogue angle antique architect architectural calculate calculation caliper circle circles compass compasses craft design dimensions dividers draw drawing engineer engineering equipment geometry handcrafted handmade instrument mathematics measure measurement mechanical objects paper plan planning precise precision scale science sketch technical