It's a primitive form of abstraction, and we now know this happens in the fusiform gyrus of the brain, because when that's damaged, these people lose the ability to engage in Buba Kiki, but they also lose the ability to engage in metaphor.
这是抽象的一种原始形式. 我们现在知道，这发生在大脑的梭状回. 因为当那里受损时, 病人就失去判断“Buba Kiki”的能力， 他们也失去了比喻的能力。