在广阔的区域，这种快速的变红能使头足类动物不被捕食者发现，就像红色的物体在蓝光下不易被看见一样。
In the wild, this quick blush hides the cephalopods from their predators, as red objects are imperceptible under blue light.
而从我们人类的脸在愤怒、兴奋或高兴时也会变红这一点来看，对这种颜色的识别对视觉交流也有辅助作用。
And as evident from humans' tendency to turn red when angry, aroused or upset, such color recognition assists visual communication, too.
例如，为什么有些树的叶子秋天变红，而另一些树的叶子则变黄，这种现象应该有它合理的原因。
For example, there is a good reason why some leaves turn red and others yellow in the fall.
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