In this way, insight that is the direct means leading to final

In this way, insight that is the direct means leading to final
deliverance can be fruitfully developed.
Arūpajjhāna (absorption of the formless sphere)
An aspirant who has accomplished the fourth jhāna may be able
to develop the arūpajjhānas, attainment of which is generally spoken of
as arūpasamāpatti. The same procedure, of the rūpa moving from a lower
stage to a higher stage, is also found in the context of the arūpajjhānas.
The arūpajjhānas, or jhānas associated with the formless sphere
(arūpāvacara) admit of a fourfold division:
(1) Ākāsānañcāyatana: the sphere of the infinity of space.
(2)Vīññā añcāyatana: the sphere of the infinity of
consciousness.

(3) Ākiñcaññāyatana: the sphere of nothingness.
(4) Nevasañnānāsaññāyatana: the sphere of neitherperceptionnornonperception.
The arūpajjhānas are, however, beyond the scope of the present
study, being noted here solely for the sake of completeness.
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Ref : TUDY OF MOST VENERABLE MUNBH RIDATTA THERA’S METHOD OF
CITTA BH VAN “BUDDHO” PRACTICE
byMrs. Phassarapha Phaisarnariyasap