Method
Changing lines and the resulting hexagram
When a coin toss produces 6 or 9, the line is changing: it becomes its opposite. Change every moving line at once and you get the resulting hexagram, which shows where the situation is heading.
The four line values
Each toss of three coins gives a total of 6, 7, 8 or 9. Six is old yin and nine is old yang: both are moving. Seven is young yang and eight is young yin: both are still.
A cast with no 6s or 9s is a still chart. Nothing is moving, so the reading describes the situation as it stands; in Agua this is stated explicitly instead of being presented as a separate hexagram.
Reading with one, several or six moving lines
With one moving line, that line carries the specific advice while the base hexagram gives the setting. With several, read the base hexagram first, then the resulting one, and treat the moving lines as the places where the change is being made.
The tradition has disagreements about how many moving lines to emphasise. Agua shows every moving line and does not pretend there is only one accepted convention.
Where to look next
Agua marks moving lines in gold in the chart drawing, and links the result to the hexagram pages so you can compare the two figures.
If the two hexagrams look contradictory, that is usually the point: the base figure describes the conditions, the resulting figure describes the direction.