This pillar is deliberately bare: one instrument, one room, no rain bed and no percussion. It exists for people who find layered ambience distracting and want something closer to a practice room.
The instruments here are physically modelled rather than sampled. Harp, koto and kalimba use Karplus-Strong plucked strings: a short noise burst circulates through a delay line and loses energy on each pass, which is close to how a real string behaves. Cello and shakuhachi use sustained oscillators with a slow attack and a filtered upper partial.
Because there is no noise layer, small changes in the filter ceiling are audible. A seed with a 980 Hz ceiling sounds darker than one at 2,200 Hz even when the notes are the same. If a track feels too sharp on laptop speakers, move to a seed with a lower ceiling.
These work best at low volume. The point is not to fill the room but to give it a texture at the edge of hearing.