Tray
Ancestral Festival
You put part of your food on a plate, then put that on a tray to keep it safe. This tray is an offering for the ancestral festival, where your ancestors' spirits visit you to check in and share some of that food you're offering on a tray.
ぼん
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The plate you put on the tray for the ancestral festival is made of bone (ぼん). Bone china, that is. How fancy… And appropriate, considering bone china is made from actual bone.