Five-implication theory. Wuyun is actually a Buddhist theory about what elements the human body and its physical and mental phenomena are made of. Wuyun's rhyme is a transliteration of Sanskrit, which means accumulation or harmony. Buddhism believes that all sentient beings in the world are formed by the sum of five aggregates, and a person's individual life is also formed by the sum of five aggregates.
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The color aggregation in the five aggregates is divided into internal color and external color, which are root and environment (dust) respectively. Dust is what we know, and roots are what our knowledge depends on to know the external environment. The psychology of contact between the heart and the environment is called touch. What can know the external environment at that time is knowledge. After contact with the environment, the mind will continue to receive, think and act. After that, three kinds of bitterness, joy, abandonment and birth. At the same time, the mind has constructed various forms. Give them all kinds of names, which is called thinking. After establishing famous sayings and adding troubles, good and evil are born, and even the body, mind and heart are mobilized to start a business. This is the relationship between five connotations-color, acceptance, thinking, action and knowledge. This is how our life keeps moving forward.
Reference Black Cloud-Baidu Encyclopedia