Ключевые слова: black, building, city, clipart, collection, commute, concept, connection, control, design, device, eco, element, environment, flat, glyph, icon, illustration, infrastructure, isolated, light, logo, maintenance, management, map, modern, negative space, network, pack, passenger, people, pictogram, pollution, public, regulation, resource, service, set, silhouette, solid, structure, supply, symbol, traffic, transport, urban, utility, web, wifi,