想看到这个幻视，盯住圆心，注意边缘的闪烁。
To see the illusion, look at the center of the circle and notice the peripheral shimmering.
注意边缘的窥器是尖锐的。
这是很重要的要注意边缘的临别的工具，是为了使该线偏低。
It is important to note the the edge of the parting tool was to brought to the line on the low side.
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