Zhao Hai kept the stone tables, not because he found anything special about them. On the contrary, he didn't find anything special about them. He just felt that the shape of the stone tables was very interesting. Plus, the stones were very strong. He planned to keep the stone tables in the medium and tidy them up when he went back. Perhaps they would become a good set of stone tables for his own use.
However, when Zhao Hai put the stone table into the medium, it immediately shook. Then, the stone outside the stone table slowly fell off. At the same time, the stone table separated. The stone table that looked like a whole was now made of pieces of stone.
When Zhao Hai saw this, he immediately knew that something was wrong. He diverted some of his attention to the space. As expected, the stone table slowly fell to the ground. Zhao Hai took a look and could not tell that it was a stone table. It was clearly a set of eight Trigrams made of stone.