Sandakada Pahana Moonstone

The sandakada pahana — the carved granite semicircular moonstone laid at the foot of Anuradhapura-era temple stairways — is one of the great achievements of Sinhalese Buddhist stone art. Concentric bands of flame, an elephant-horse-lion-bull procession, a ring of hansa swans, and a central half-lotus are cut in low relief into weathered, lichen-darkened granite.

This design system distills that worn-stone threshold into a digital language: graded gray tones standing in for value rather than hue, soft directional relief shadow, stone grain, and strict concentric semicircular geometry. There is no color accent anywhere — depth comes entirely from light raking across carved granite.

半月石（sandakada pahana）是斯里兰卡阿努拉德普勒时期佛寺台阶脚下铺设的半圆形花岗岩门槛，是僧伽罗佛教石刻艺术的杰作。火焰环、象马狮牛的兽群行列、天鹅（hansa）环与中央半莲，以浅浮雕的手法刻入风化、被地衣染暗的花岗岩之中。

本设计系统将这块历经千年的门槛石转译为数字语言：以分级灰调表达明度而非色相，配以柔和的方向性浮雕阴影、石材纹理与严格的同心半圆几何。整套体系不含任何彩色点缀——所有的深度都源自掠过石面的光与石刻的明暗对比。