It is a paradox that defies the imagination: the most flamboyant colours, as if captured in a kaleidoscopic prism, hidden in the quietest corners of our urban jungles. An elevator shaft, which otherwise houses only the creaking of cables and the smell of metal, is transformed under the glow of bright rainbow colours into an invisible painting, a secret gallery revealed only to engineers and casual glances. The colours seem to dance, even in the darkness, as if they know their audience will never see the full spectrum, but still cry out fearlessly: "We are here, in the heart of the machine!"