Although Chan becmae famous for its radical techniques, it also followed some standard practices such as daily chanting of scriptures, such as the Lotus Sutra (like Tiantai).
In a Chan / Zen temple, there is an altar or butsudan where offerings can be made for the Buddha or bodhisattvas.
This same kind of altar is used in people’s homes to communicate with ancestor spirits, so in a way using a butsudan in a temple is a way of communicating with bodhisattvas from the past