Why did Bing Xin change her poems to make tourists wonder where spring is?

The ancients once wrote: "Children don't know where spring is, but only pick tourists to travel." Bing Xin believes that this poem can also be reversed: "Tourists don't know where spring is, but only pick children."

Although it only moves the word order, it reflects grandma Bing Xin's infinite care for her children. Those tourists don't know exactly where spring is, so they have to choose places with many children, thinking that places with many children are always interesting.