Isometric Grid Gadget Eras Visualization

2x2 grid, 16:9, top collectible gadgets of 1850, 1940, 1990, 2026: INPUT: $ THEME, $ SHAPE // Create isometric guide field Ω on the base plane. Ω = isometric_grid( angle=30°, scale=1.0 ) F = ∇Ω // outward build direction, center to edge Curl = ∇×Ω // local terrain rotation, staircase and road curving Div = ∇·F // density of details, figures, labels // Base landmass: silhouette-masked extrusion of $ SHAPE, top surface terraced. // Center-out growth: the core landmark of $ THEME placed at the global maximum of |F|, then sub-scenes propagate outward. // Terrain: heightmap generated from $ THEME's semantics, directed by F and Curl. // Cross-section: side walls reveal strata layers: topsoil, stone, clay, roots, aquifers - each with microfossils and artifacts. // Figures: 100+ tiny characters placed along high-Div streamlines; their poses inferred from theme activity. // Labels: small clean annotations at key scenes (max 12), placed in negative space. // Lighting: soft global illumination, subtle ambient occlusion, one key light at 45°, one low fill. // Render: isometric camera, orthographic with slight perspective, 8K matte finish.