Liu I-chang states that his conversations with Cheng have given him much food for thought and allowed him to more accurately visualize the lifestyles and technology of prehistoric peoples. "We help each other a lot." For instance, Cheng has brought his ceramicist's mind's eye to bear on the mystery of why gravel was mixed into prehistoric pottery.
劉益昌就表示，鄭永國與他討論的過程，可以給他許多刺激，讓他對史前人的生活與技術產生更接近真實的揣想，「我們是互相幫助。」