The Mechanical Gnome's Unfinished Transaction

You enter a circular vault-workshop where brass ribs arch over shelves of sealed curiosities, humming softly as if the walls are thinking. At a tiny walnut counting desk sits a beautifully jointed gnome of copper, porcelain, and blackened steel. Its emerald glass eyes brighten, reflecting the gemstones arranged before it. Oil, hot metal, and faintly bitter ozone scent the air. A brass balance trembles on its stand, its needle ticking between two engraved marks while three ledgers rustle in a draft from hidden gears. Behind Copperpot, chairs fold and unfold by themselves, a bell tests one sharp note, and a velvet curtain twitches around something with a loaded spring.