Generate an image  of a futuristic , high-tech  factory scene where  a swarm of  robots, ranging  in size from  small spherical drones  to large humanoid  machines, work  together in harmony , their black  and red metallic  bodies glistening  under bright LED  lighting, with  sparks flying as  they weld and  assemble complex machinery , surrounded by  holographic blue prints and screens  displaying real-time  data, conveying  a sense of  efficiency, precision , and innovation .