original_query: What was the reason for the construction of a new astronomical clock tower by Su Xie?
query: What was the reason for Su Xie's construction of a new astronomical clock tower?
answer: After the Jurchen army dismantled Su Song's clock tower, Emperor Gaozong of Song instructed Su Xie (Su Song's son) to build a new one.  However, Su Xie was unsuccessful, believing his father had intentionally omitted crucial information from his writings.