From the introduction:
Sitting Shiva is a game about mourning, family, connection, and silence. In Jewish tradition, when someone dies, the members of their immediate family sit shiva for them. During this weeklong period, the family members sit on the ground or in low seating, go barefoot, wear torn shirts or torn ribbons pinned over their hearts, and are not expected to perform basic tasks. Other family and friends will come visit, bring them food and be present for the mourners.
In a house of mourning, silence and low voices are the tone. Conversation focuses on memories and stories about the deceased, mostly positive. The mirrors are covered with black cloth to discourage vanity and frivolousness. Seating should be low and couches and chairs should have cushions removed. People may sit on the cushions on the floor, or on the couches without cushions. A tall candle will be burning at all times.