When the lifegiving water (vai ora) of Tane no longer is present the vegetation withers and dies. The season of straw has arrived. This comes, according the rongorongo texts, with the heat of high summer (or noon by reason of a similar structure for the diurnal cycle).

The sign of desiccation is formed like Y and it is used in the toa glyphs e.g. to indicate that the wooden pillars needed to raise the sky must be dry (no longer living).

These pillars held up the sky roof not only during daylight but also during the night. Indeed, because they must be dry (in order to be hard enough) the work with raising the sky roof should begin in the season of straw when sun is declining, not when sunlight is increasing and the greenery growing.

Untangling the structures of the night and day calendars in Tahua by way of using the words of Metoro, the small signs in the glyphs, counting, and the use of the parallel texts in H/P/Q.