Here are some English - language references related to your question: ### Books - ***The Psychology of Color in Design*** by Eva Heller. This book elaborates on the psychological effects of colors and their applications in various design fields. It may offer insights into why specific colors are used to represent the intensity and rarity of game props or cards, as well as the use of colors for indicating health and mana. Citation format: Heller, E. (Year). *The Psychology of Color in Design*. Publisher Name. - ***Game Design: Theory & Practice*** by Richard Rouse III. It comprehensively covers various aspects of game design, including the design principles of game systems, user experience design, and visual design. It might contain relevant content on how color systems in games are designed and the reasons behind them. Citation format: Rouse, R. (Year). *Game Design: Theory & Practice*. Jones & Bartlett Learning. ### Academic Papers - ***"The Application of Color in Game...