The article discusses cultural differences between American and Chinese students that can contribute to misunderstandings and the establishment of an invisible "Great Wall" between roommates from the two cultures. It examines four common "bricks" in this wall: differences in eye contact norms, views on gender roles, socializing habits, and study practices. The article is based on surveys of 50 American students with Chinese roommates about their experiences and perspectives. It aims to help Purdue students better understand intercultural challenges and break down barriers between students from the US and China.