Lưới Huy Hiệu Tiểu Vũ Trụ Biểu Tượng Toán Học

A 2x2 grid of four monumental mathematical symbols crafted as 3D micro-world reliefs inside circular medallions: - Top Left: [The Pi (π) as a carved stone relief city inside a metal coin, tiny staircases and colonnades, equations engraved around the rim] - Top Right: [The Sigma (Σ) as a mechanical relief with gears and steam vents, patinated bronze, sharp rim lighting] - Bottom Left: [The Integral (∫) as a neon rain-soaked micro-alley world inside a steel medallion, reflective puddles, tiny silhouettes] - Bottom Right: [The Infinity (∞) as a dust-storm desert relief inside a warm wooden coin, swirling sand texture, miniature rovers] Collector macro product photography style, crisp rim highlights, realistic metal and wood grain, shallow depth of field, high contrast, clean Swiss 2x2 grid layout.