I've adapted the ogham tree alphabet to be days of a lunar month, by adding a few more trees (three-to-four at the end of the month... sometimes the fourth one gets skipped), and hand ogham works just like this. Each aicme is five trees, so the first aicme goes across all the bottom phalanges, and I kind of consider an aicme like a week. Five "weeks" plus a few days in each month.