It was almost about time for him to go to bed, so I promised to make the metallic ball together next day's night. Before that, he said that he would prepare materials and tools for the creation; some aluminum foil rolls, a hummer, sand papers, and liquid polisher.
The process was shown below, from the left to the right.
It took seven hours over a period of 2 days. Although I sometimes helped him with the work, my little son did almost all the processes on his own. What surprised me is the he was really patient. What a wonderful concentration! He never ceases to amaze me when creating something.
I hope he chooses a job in the future, in which his amazing creativity could work well. I will spare no effort to make his dreams come true whatever job he gets after he grows up.