绝对避免使用钢绳等金属线类，防止蓄电池短路。
Avoid the use of wire rope and other metal wire absolute, prevent battery short circuit.
这使得由于光学及视网膜的结构特点的原因使视网膜的像上模糊，某些由相交线构成的几何错觉图形，实际上是类“拧绳”错觉图形。
Because of the inevitable blur of a optogram, some geometric figures composed of intersection lines are of twisted cord illusions in reality.
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