Explain the significance of Cai Guo-Qiang’s Project to Extend the Great Wall of China. . . as an extension of and commentary on the Great Wall

Please provide the best answer for the statement.

For his project, Cai worked with a band of more than 100 Japanese and Chinese volunteers to create a new idea for the wall emphasizing China’s place in the global community rather than the self-containment that the Great Wall originally symbolized. Cai used gunpowder, a substance of key cultural significance in China, to investigate its destructive and the constructive potential. Detonation of the gunpowder created a red line visible from high above the earth, where Cai thought observers from other galaxies might see the line dividing Mongols from Chinese so many centuries earlier, which had now brought earth-dwellers together in artistic creation.