Cloud computing reference architecture, futuristic cityscape, skyscrapers, modern buildings, sleek lines, metallic materials, LED lights, foggy atmosphere, misty morning, birds-eye view, low-angle shot, dramatic lighting, 3/4 composition, detailed textures, reflective surfaces, neon signs, digital displays, servers, cables, circuits, motherboards, processors, memory chips, data storage devices, network routers, switches, firewalls, virtual machines, cloud infrastructure, scalable architecture, on-demand resources, multitenancy, resource pooling, measured service, billing systems, identity management, access control, security protocols.