Buddha Abhidhamma - Ultimate Science - BuddhaNet

251
Now in the external (bahiddha) world, only two utuja-kalàpas
are found. All inanimate things such as trees, stones, earth, water,
fire, corpses, etc., are made up of utuja-suddhaññhaka kalàpas. The
sounds produced by beating two sticks together or by rubbing
of branches in the wind or by musical instruments such as violin,
piano, radio, cassettes, etc., are utuja-sadda-navaka kalàpas.
Råpa-pavattikkama
(Arising of Material Phenomena)
Before reading this section, readers are advised to review the
“four modes of conceiving” on page 196.
All the 28 material qualities occur undiminished, if
circumstances permit, in an individual during a life-time in
kàmaloka (sense-sphere).
But at the moment of rebirth (pañisandhi-kàla), in samsedajapersons
and opapàtika-persons, at most seven kammaja-kalàpas
comprising eye-decad, ear-decad, nose-decad, tongue-decad, bodydecad,
sex-decad and heart-decad are manifested. However, eye,
ear, nose, and sex-decads are sometimes not manifested.
In gabbhaseyaka-persons(womb-born creatures) only three
kammaja-kalàpas comprising body-decad, sex-decad and heartdecad
are manifested at the moment of conception (pañisandhikàla).
Here again the sex-decad may not be manifested in some
particular individuals. After conception, during life (pavatti-kàla),
the eye-decad and the rest are manifested slowly in due order.
Of the groups of material qualities which are produced in
four ways, kammaja-råpa starts to form at the moment of conception
and it goes on forming incessantly at every minor-instant.