设想一个能够从不同角度观察的抽象模块。
Imagine an abstract module that can look like either or both.
很多特性都很困难很有挑战性，只是观察的角度不同。
Many of them were rather difficult and challenging, just from different aspects.
也许富有经验的设计者观察事物的角度真的是与众不同。
Maybe very experienced designers just see things differently.
但在不同的光照下和不同的角度观察，颜色会有不同的变化。
However, under different light and different angles, colors have different changes.
但在不同的光照下和不同的角度观察，颜色会有不同的变化。
However, under different light and different angles, colors have different changes.
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