Records also reveal that in the parks of Han dynasty palaces not only were there raised a great variety of deer, birds and other beasts, but "elephant hides" and "white deer hides" were also constructed for watching strange creatures from afar. There were even mechanical bronze dragons spouting water, wave machines, and drinking sages.
根據記載，漢代宮苑裡不但「畜糜鹿麑麂，鳥獸百種」，還另建「觀象觀」、「白鹿觀」遠眺奇獸，此外更有銅龍吐水、仙人銜杯、激水為波之類的機關佈景。