必须知道的历史知识：南北朝时期，梁武帝信奉佛教，修建寺庙委托大画家张僧繇作画。传说，他仅用三天时间在安乐寺墙上绘制四条金龙。这些龙栩栩如生，但令人诧异的是，它们竟然没有眼睛。当众人请求他为龙点睛时，张僧繇解释道：“给它们眼珠并非难事，但一旦点上了，它们将会破壁飞走。”人们不相信他的话，只好等待真相。

有一天，在众目睽睹之下，张僧繇决定为两条龙“点睛”。当他轻轻地给第二条龙点上眼睛后，一阵狂风雷电 suddenly swept through the sky, and the two "living" dragons burst forth from the wall, flying into the clouds. The people were left in awe, unable to speak.

The story of how Zhang Sengyou gave life to his paintings with a single stroke has been passed down through generations as an example of artistic mastery. It is said that he was able to capture the essence of his subjects with just a few strokes, imbuing them with a sense of life and energy. His technique was so advanced that even today, artists continue to study and learn from his work.

Zhang Sengyou's legacy extends beyond his art alone. He was also known for his skill in sculpture and architecture, leaving behind a lasting impact on Chinese culture. His dedication to his craft is evident in every brushstroke and every detail of his work.

In conclusion, Zhang Sengyou's ability to bring life to his paintings with just one stroke is a testament to his exceptional talent and dedication as an artist. His legacy continues to inspire artists today, reminding us all of the power of creativity and innovation.