微观世界数学符号网格提示

2x2 网格，展示了 4 个巨大的数学符号，它们以 3D 微观世界浮雕的形式构建在圆形奖章内。[左上：圆周率 (π)，雕刻成金属硬币内的石刻浮雕城市，带有微型楼梯和柱廊，边缘刻有方程式。][右上：西格玛 (Σ)，机械浮雕，带有齿轮和蒸汽孔，青铜色泽，边缘有锐利的光线。][左下：积分号 (∫)，霓虹灯雨淋的微型小巷世界，位于钢制奖章内，有反光水坑和微小剪影。][右下：无限符号 (∞)，沙尘暴沙漠浮雕，位于温暖的木质硬币内，有旋转的沙粒纹理和微型探测车。]收藏级宏观产品摄影，清晰的边缘高光，逼真的金属/木材纹理，浅景深，高对比度，瑞士 2x2 网格布局。

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**Original English:**
2x2 grid of 4 monumental mathematical symbols built 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, crisp rim highlights, realistic metal/wood grain, shallow DOF, high contrast, swiss 2x2 grid layout.