Why are billiard balls structured the way they are?

Billiard balls are structured as smooth, spherical objects to ensure uniformity in motion and interaction with the table and each other. Their round shape allows for consistent rolling and optimal control during gameplay, minimizing friction and maximizing speed. The material, typically phenolic resin, provides durability and a consistent response to impact, ensuring fair play. Additionally, the bright colors and markings help players easily identify each ball during a game.