Create a contemporary material collage that transforms cork growth rings into the topography of an invented city. Layer naturally varied cork veneer at different heights across one square panel, allowing ring patterns to become districts, river bends, and contour lines. Add restrained insets of indigo handmade paper for water and thin copper wire connecting a few abstract civic nodes. Use a square 1:1 near-frontal gallery documentation view with a slight overhead angle; let a dense lower-left core dissolve toward a spacious upper-right edge. Warm raking light should reveal cut edges, cork pores, paper fibers, copper shadows, and subtle adhesive seams. Limit the palette to cork brown, charcoal, indigo, and oxidized copper green. Preserve tactile handmade irregularity and clear layered relief. No readable text, map labels, recognizable real city, frame, hands, logos, watermark, or digital interface styling.