The school's principal, Ho I-chun, took the chance to give a lesson. She said that in old times, people made storage ponds by mixing clay and regular soil together and then having their oxen trample on it to compact it and make it waterproof. "Nowadays we can't find any oxen so we had the kids experience it for themselves with their own feet!"
校長何怡君趁機機會教育，她說，古人蓄水塘的方式就是這樣子，將黏土與一般土壤混合後，放牛下去踩踏，好讓土壤緊實，「現在找不到牛了，所以我們讓小朋友親身下去體驗用雙腳踩出『牛踏層』的感覺！」