You often will see businesspeople dressed in very nice suits, and sometimes they are what are called " pinstripe." There's a thin line pattern on the fabric.

你经常会看到商务人士穿着非常漂亮的西装，有时他们就是所谓的“细条纹” 。 面料上有细线图案。

Because of the consistent gray line pattern, your brain assumes the rest of the image is just like that and misses the black dots until you look directly at them.

因为你看到规则的灰线图，你的大脑断定图片剩下的部分都一样，所以你忽略了那个黑点除非你直接盯着黑点看。