在阳光或灯光的照射下，所有的实体都难以遁形，会漏出投影在墙上、地面上。
从墙上或地面上的投影，我们可知悉某物体的形状，并略知其体积。但那也只是略知，真正的长短，大小，与投影所显现的，可能会有些出入不同。
好比以上的图片，我还是分辨不出图片里的枝叶，它的投影是那一个！
不过如果所照射的物体与投影之间的距离很靠近，体积对比便会很接近。
这就好比我们虽能从个人的肢体表情，间接探索某人的思维情趣，但不可全然信之！需要仰赖近距离的接触，观察所捕捉到的信息，才能得到更准确的判断。
Based on the shadow cast onto the wall / floor, we can decipher the shape and possibly the dimension of an object. But sometime, the information gathered may not be accurate, particularly if the shadow is cast further away from the object.
Similarly, don't be too confident that we can decipher a person's thought through his/her body language and/or facial expression. We need to gather more information by getting close to the person, and better still interact with him/her!
Look can be deceiving at time!
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