Germany, NRW, Cologne, High-rise construction, crane, Economy, industry, construction, construction works, building site, reconstruction, high-rise, business buildings, facade, disguise, Baukran, outrigger crane, construction, lifts, loads, height, filigree, office high-rise, office buildings, holes, building, glass facade, symbol, concept, building industry, machine, cooperation, organization, security, crane leaders, construction industry, construction, ascent, upswing, capital, growth, real estates, perspectives,