For a seemingly trivial example, imagine a frog making repeated jumps of the same length in the same direction, starting from the corner of a square on an infinite checkerboard.
举个看似平凡的例子，假设一只青蛙从无限大棋盘上一个方块的角落出发，以相同步长朝相同象限方向一再重复跳跃[3]。
This is just like the famous Adelson checkerboard optical illusion. In the image below, square a is exactly the same shade as square b, but they look totally different.
这个例子和著名的阿德尔森棋盘错觉是一样的。在如下的图像中，方块a和方块b的色度是一样的，但是他们看起来完全不同。
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