How many rules govern the tea ceremony?

The answer is 7.

1)  Make a satisfying bowl of tea.

2) Lay the charcoal so that the water boils efficiently.

3) Provide a sense of warmth in the winter and coolness in the summer.

4) Arrange the flowers as though they were in the field.

5) Be ready ahead of time.

6) Be prepared in case it should rain.

7)Have consideration toward your guests.

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equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.