当一组特定的静态图像，例如几何图形，以指定的频率切换，便会产生某种动态图片的效果。
When a number of certain static images, such as geometric figures, for example, interchange with a specified frequency, it creates something like a motion picture effect.
被试实验中的表现在观看树木、田地、小山后能够很快得到恢复，而观看街道、工业区、甚至几何图形都不能达到这样的效果。
People's performance was soon restored by picture of trees, fields and hills, but not by streets, industrial units or even complex geometric patterns.
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