What is mass? For each sequence an online preview is availableand a presentation file (PowerPoint) can be downloaded. Click on the chosen sequence. Sequence 1: To understand the why and how of the Eucharist. Sequence 2: The place, the furnishings, the liturgical objects and ornaments, the 'actors' of the liturgy. Sequence 3: The mass. Introductory rites, liturgy of the Word. Eucharistical liturgy, the rites of conclusion.