The ten types of rupas below are termed non-concretely produced matter because they do not arise directly from the four essential rupas, but exist as modalities or attributes of the concretely produced matter.
In the Abhidhamma, space is not so much outer space, but rather the subatomic and inter-atomic void that delimits and separates objects and groups of rupas.
Abhidhamma distinguishes between two ways of communicating one’s ideas, feelings and attitudes. This can be done by gesturing or by speaking.
A gesture is a particular change in the mind-produced air-element that causes the body to move in ways that show one’s intentions.
Speech is a particular change in the mind-produced earth-element that causes one to speak and thereby convey one’s intentions.
This category includes the two communicative rupas above as well as three other rupas: lightness, flexibility and adaptability. All rupas co-existing with these become lighter, more flexible and more adaptable.
Lightness has the characteristic of non-sluggishness. Its function is to remove heaviness in matter. It is manifested as good transformation ability.
Flexibility has the characteristic of non-rigidity. Its function is to remove stiffness in matter. It manifests as non-resistance to any kind of action.
Adaptability has the function to remove unwieldiness. It is manifested as non-weakness.
These four rupas constitute the basic characteristics of all rupas, that is, all material phenomena.
Initial formation of matter is to cause material entities to appear for the first time.
Continued formation of matter has the function of anchoring its existence. It manifests as non-interruption.
Decay is characterized by the maturation and aging of material phenomena.
Impermanence has the characteristic of complete material dissolution. Its function is to make matter subside. It manifests as destruction.