Ключевые слова: 2d, abstract, abstraction, beware, builder, carcass, careful, collage, combined, composition, concept, connecting, connection, contractor, crossing, engineer, flat, framework, geometric, grid, hard hat, hardhat, hat, helmet, icon, illustration, industrial, insurance, line, linear, lines, map, modeling, mosaic, net, network, organized, pattern, protect, protection, protective, safe, safety, structure, wireframe, work, worker, workman,