The rosettes down the sides of this chair are set at a constant spacing, and that spacing is decided by the height of the chair rather than being fixed.
When a design like this is made taller, there are two options: make the rosettes bigger, or use more of them. Enlarging them looks wrong immediately - the rosette is a flower, and a flower has a natural size relative to the frame it sits on. Adding more keeps that relationship and simply extends the rhythm.
So our artisans keep the rosette size constant across every version of this chair and change the count. A short version might carry five a side, a tall one seven, and the spacing between them is then adjusted very slightly so the run divides evenly between the seat rail and the crest - starting and ending with a whole rosette, never a partial one.
It is the same rule that governs balusters on a staircase or spindles in a railing: keep the element, change the count, and divide the run so both ends are whole.