“U S”是使用 FontVibe AI 创作的激光切割文字效果。粗壮无衬线大写字母从暖色桦木上激光切出，切口边缘焦黑、木纹清晰，凸立在深色胡桃木板上，琥珀色侧光。

Precision fabrication aesthetic: text exists as physical cut material — not rendered, not painted. The laser kerf is the only boundary: mathematically exact edges, zero roughness. MATERIAL SURFACE RULES: — Wood: warm grain on letter face (birch honey or dark walnut); charred dark seam along every kerf edge; cross-grain cross-section at cut face. Gentle warm transmission through thin sections. — Acrylic: glassy-smooth kerf edges scatter light as luminous halos — frosted emits soft white-blue edge glow; clear creates prismatic edge-light. Face stays matte or polished. — Metal: bright machined cut face against brushed exterior. Raking light reveals mechanical precision and directional grain. — Paper/Organic: bone-clean cut edges casting hairline shadows on backing. Maximum filigree detail preserved. FABRICATION LAWS (all materials): — Enclosed counters (O,D,B,P,R,A) retained by structural bridge connections — thin material tabs turned into design features. — Material thickness always visible as dimensional depth: each letter is a physical slab. — Negative space is real air or backing material showing through. — No added outlines, glow effects, or drop shadows — the kerf edge is the only boundary. FORBIDDEN: graphic fills, smooth gradient fills on letter faces, extruded 3D depth. When no specific material is defined by the font: default lighting — warm amber side light raking from low-left, deep warm shadow on right and behind, dark warm-brown craft-studio background. A precise laser-cut typographic object reading exactly “U S,” with a clear open gap between the letters, made from a single slab of warm honey birch plywood and resting on a dark walnut workbench. The two letters dominate the composition, generously scaled and carefully spaced, their material thickness plainly visible along the cut faces. Fine directional birch grain runs across each broad face; every mathematically clean kerf carries a narrow dark char seam, and the exposed cut faces show crisp cross-grain. The open interior of the U and the gap between the letters reveal the walnut surface beneath as real negative space. Warm amber light rakes in from low left, catching the wood grain and precisely revealing the slab depth, while deep warm shadows fall to the right and behind. Keep the surrounding craft-studio surface quiet and dark, with subtle timber grain fading toward the edges. Nothing else in the frame: no added outlines, glow, painted effects, or decorative objects.