Core Viewpoint - The article highlights the significance of the "Yishi Tu" (Relay Messenger Map) and other artifacts from the Wei-Jin tombs in Gansu's Jiayuguan, showcasing their historical and artistic value, as well as their cultural implications for ancient Chinese postal systems and daily life [3][5][12]. Group 1: Cultural Significance of Artifacts - The "Yishi Tu" is a painted brick that reveals ancient postal codes, depicting a relay messenger in motion, symbolizing the confidentiality of the postal system [5][6]. - The "Yishi Tu" was selected as a core element of the China Post logo in 1982, emphasizing its importance in Chinese postal history [5]. - The "Yishi Tu" features a deliberate omission of the messenger's mouth, representing the principle of confidentiality in the postal system [5]. Group 2: Artistic and Historical Insights - The "Yishi Tu" is noted for its minimalist yet expressive artistic style, using ochre as a base color and simple lines to convey dynamic movement [5]. - The tomb also contains a "Barbecue Scene" mural, which illustrates the entire process of slaughtering and cooking, earning it the title of "China's First Barbecue Picture" [8]. - The "Feast Scene" mural indicates the presence of a mature "shared dining system" during the Wei-Jin period, showcasing the social customs and culinary culture of the time [10]. Group 3: Educational Impact - The "Muma Tu" (Horse Herding Map) and "Caisang Hushang Tu" (Mulberry Picking Map) have been included in the new national history textbooks, highlighting their role as historical evidence of ethnic integration and prosperity in the Wei-Jin period [12]. - These artifacts reflect the daily life and cultural practices of the time, providing insights into the socio-economic conditions of the Hexi Corridor [12].