follis Directory References Contents Ask the Chatbot a Question follis ball Ask the Chatbot a Question Learn about this topic in these articles:use in Roman recreation In ballThe largest, the follis, contained an air-filled bladder, similar to a modern football (soccer ball) or basketball.Read More Britannica ChatbotChatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.