他在20多年里反复描绘这座池塘，记录下了水面反光的细微变化。
He painted the lake repeatedly for more than 20 years, recording the infinitesimal changes in the light reflected in the water's surface.
这是因为随着人们围绕作品移动，随着白天光照条件变化，玻璃的颜色、反光、色调和饱和度慢慢改变。
This is because the glass's colours, reflections, hues and saturation levels slowly morph as one moves around the work and as light conditions vary during the day.
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