观察是人们认识的开始.观察靠视觉去完成,所以视觉是很重要的.可是, 人的视觉有时会产生错觉,这在心理学中叫做“视觉的欺骗”.下面举几个容易产生错觉的几何图形. 图1中,线段AB和CD是两条互相垂直的线段.看起来,AB要比CD长一些,实际度量一下就可以发现,它们的长度是相等的. Observing is the beginning of people’s understanding. Observing depends on vision, so vision is very important. However, people’s vision sometimes creates illusions. This is called “visual deceit” in psychology. Here are a few examples that are easy to create illusions. Geometry. In Figure 1, line segments AB and CD are two mutually perpendicular line segments. It seems that AB is longer than CD, and the actual measurement can be found that their length is equal.