There are many simple balls.
But not every ball is popular, nor has everyone played them. Balls that are too obscure, most people probably won't be interested in.
This is also Chen Ba's consideration.
With the golden trio of gun, car, and ball, there can be many choices within the ball category. The more famous ones are basketball, soccer, volleyball, table tennis, and so on.
Unfortunately…
These ball sports are too specialized and competitive. Just understanding the various professional rules might take ten days to half a month.
If you want to use these popular ball sports as material to create a game, at least two or three years, or even three to five years of data collection and groundwork is needed in the early stage.
Other ball games are the same.
So, when Lu mentioned the word "ball," he thought: Is there a ball that is simple and understandable, highly familiar, and one that most people have played or heard of?
"Do glass balls count as a sport?"
