Literature Reference: 松柏瞻虚殿，尘沙立暝途。—— 《行次昭陵》 Gazing at the empty hall amidst pine and cypress, standing on the dusty path at dusk. Source from 'Xingci Zhaoling'.
尘: Dust and loess.
沙: Sand, grains of sand.
Meaning: Dust and sand symbolize the passage of time and the changes of the world, embodying resilience and perseverance.