Chan Buddhism, also known as Chinese Zen, is a school of Buddhism that originated in China and emphasizes the practice of meditation as a means to enlightenment. As a result, Chan Buddhism does not place as much importance on rituals and ceremonies as other forms of Buddhism. However, there are still some specific practices and rituals that are commonly observed in Chan Buddhism.

One of the main practices in Chan Buddhism is zazen, or seated meditation. This involves sitting in a cross-legged position, with the eyes half-open and the mind focused on the present moment. Through this practice, practitioners aim to quiet the mind and gain insight into the nature of reality.

Another important practice in Chan Buddhism is koan study. Koans are paradoxical statements or questions that are used to challenge the mind and break through conceptual thinking. They are often used in conjunction with zazen to help practitioners deepen their understanding and experience of enlightenment.

In addition to these main practices, there are also some specific rituals that are observed in Chan Buddhism. One of these is the chanting of sutras, which are sacred texts that contain the teachings of the Buddha. Chanting is believed to be a form of meditation and can help practitioners focus their minds and cultivate a sense of peace and calm.

Another ritual in Chan Buddhism is the use of incense. Burning incense is believed to purify the mind and create a peaceful atmosphere for meditation. It is also seen as a way to honor the Buddha and other enlightened beings.

While these practices and rituals are commonly observed in Chan Buddhism, they are not seen as necessary for enlightenment. In fact, Chan teachings emphasize the idea of "sudden enlightenment," meaning that enlightenment can be achieved in a single moment of realization, rather than through a gradual process of practice and ritual.

In conclusion, while Chan Buddhism does have some specific practices and rituals, they are not seen as essential for enlightenment. Instead, the focus is on the practice of meditation and the cultivation of a clear and focused mind. Through these practices, practitioners can gain insight into the true nature of reality and ultimately achieve enlightenment.