Marco Polo's book provided descriptions of life in China that would have been amazing to Europeans at the time. However, historians have identified several errors and omissions that make the accuracy of Marco's accounts questionable. Specifically, Marco did not mention important aspects of Chinese culture like the Great Wall, foot binding, tea drinking, and calligraphy. Additionally, historians found names of Marco and his family were not recorded in official Chinese documents from that period. It is possible that stories in Marco's book came from Persian merchants he spoke to rather than his own experiences, as they contained common errors with details in other books. Most historians are disturbed by what Marco left out of his accounts rather than what he claimed to have seen.