shawnfu

在左图中我们会看到一只花瓶或两只脸的侧影，但我们不可能同时看到脸和花瓶，因为我们的大脑是通过背景分离才辨认出一个物体的。在这张图中，因为两种互为背景的图形同样都是合理的，所以我们看到的一会儿是脸一会儿又是花瓶了。
http://jifanghua.blogbus.com/logs/2004/02/84111.html


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