两面圆形的镜子，一面静止，一面可以移动，二者都被固定在马丁·格鲁·皮乌斯博物馆的中庭。
Two circular mirrors, one still, one mobile, are mounted on the floor of the Martin-Gropius-Bau's atrium.
从固定的观察者来看运动中的表比静止的慢。
A moving clock runs slower than a stationary one from the perspective of a stationary observer.
阴阳并不是固定的、静止的，而是活跃的、可改变的。
Yin and Yang are not fixed or still but active and changeable.
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