宇宙是一张纸（和一些沙子）
这篇文章探讨了一个引人入胜的物理概念：宇宙可能像一张纸一样存在于更高的维度中。作者将这一理论与沙粒的类比相结合，讨论了我们所感知的三维现实如何可能是高维宇宙中的一种投影或表面现象，就像全息原理所暗示的那样。
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