Before revision: A child playing in a ball pit A ball pit (originally called a ball crawl, also known as a ball pool or ball pond) is a padded box or pool filled with small colorful hollow plastic balls generally no larger than in diameter.
After revision: Children playing in a ball pit A ball pit (originally called a ball crawl, also known as a ball pool or ball pond) is a padded box or pool filled with small colorful hollow plastic balls generally no larger than in diameter.