Chan Buddhism, also known as Original Chinese Zen, is a school of Buddhism that emphasizes the practice of meditation and direct experience of enlightenment. At the core of Chan Buddhism is the concept of emptiness, which is a central concept in Buddhist philosophy.

Emptiness, or sunyata in Sanskrit, is the idea that all phenomena, including ourselves, are empty of inherent existence. This means that everything is in a constant state of change and is dependent on other factors for its existence. In Chan Buddhism, emptiness is not seen as a negative or nihilistic concept, but rather as a way to understand the true nature of reality.

One way that Chan Buddhism incorporates the concept of emptiness is through the practice of meditation. Through meditation, practitioners are able to quiet their minds and let go of their attachments and preconceived notions about the world. This allows them to experience the emptiness of their own minds and the world around them. By realizing the emptiness of their own minds, practitioners can let go of their ego and the illusion of a separate self, which is seen as a major obstacle to enlightenment.

In addition to meditation, Chan Buddhism also utilizes koans, or paradoxical riddles, to help practitioners understand the concept of emptiness. These koans often have no logical answer and are meant to disrupt the mind's usual patterns of thinking. By contemplating these koans, practitioners are forced to confront the emptiness of concepts and words, and ultimately realize the emptiness of all phenomena.

Another way that Chan Buddhism incorporates emptiness is through the concept of non-duality. In Chan Buddhism, there is no separation between the self and the world. Everything is interconnected and interdependent, and the idea of a separate self is seen as an illusion. By understanding this non-dual nature of reality, practitioners can let go of their attachments and experience the emptiness of all things.

Finally, Chan Buddhism also incorporates the concept of emptiness through the practice of mindfulness. By being fully present in the moment, practitioners can let go of their thoughts and attachments, and experience the emptiness of the present moment. This can lead to a deeper understanding of the impermanence and interconnectedness of all things.

In conclusion, Chan Buddhism incorporates the concept of emptiness in various ways, including through meditation, koans, non-duality, and mindfulness. By understanding and experiencing emptiness, practitioners can let go of their attachments and illusions, and ultimately achieve enlightenment.