Ritual
Ceremony, Equation
To construct a whole ceremony, you can’t just make it up on the spot. That is not a ceremony. A ceremony has a past. A ceremony is done a certain way because that’s the way it’s always been done. In short, to build a ceremony, you have to create a ritual first. Then, the ritual can be constructed into a bigger, more lavish ceremony.
This kanji also means equation for some reason. Just think of a ceremony that involves doing math and coming up with equations. How strange would that be? Pretend you're at this ceremony.
しき
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So, you're at a ritual, but not just any old ritual. This is a full-blown ceremony and it's incredibly chic (しき). Imagine just how chic it is. Give it a shot – I'll let you come up with the chicness this time (it's good practice).