Indra is invoked to partake in the effusion rituals involving the सोम juice, as described with vivid imagery, including the use of a broad-based stone, ceremonial patters, and the churning-staff. The mortar, depicted as ever-present and vivacious, parallels the drum of a victorious host, fostering an atmosphere of ceremonial triumph [rv-1-28-1 ] rv • Book 1 .