The text then explains that both the psychological and physical dimensions are subjugated to the infinite space of undivided consciousness – “In fact, the others do not exist, and this division of consciousness into three is arbitrarily suggested only while instructing the ignorant. The enlightened one knows that there is only one reality”.
Thus the (cid ākāśa), the infinite space of undivided consciousness is the multidimensional field of Brahmn, the Unknown of the Vedas.
The Aitareya Āraṇyaka  is one of the oldest Vedic texts and at II.4.1 the Hymn of Creation commences which is also the Upanishad with the same name and is contained in the next “three” sections of the Āranyaka viz. from II.4 to II.6. It is here that the following śhlöka explains the entry of the ‘drop’ or ‘spark’ of the Unknown into the head of the new born fetus:-
Ait. Ar. II.4.3 & Ait. Up. I.3.12 
sa etam eva sīmānaṁ vidāryaitayā dvārā prāpadyata, sa eṣā vidṛtir nāma dvāḥ, tad etan nāndanam ; tasya traya āvasathās trayāḥ svapnāḥ,
ayam āvasatho’yam āvasatho’yam āvasatha iti (12)
After opening the very end of the head (simānam) , by that way he entered. This is the opening known as (vidriti) . This is the pleasing (naandanam). For that there are three abodes; three kinds of dreams as: this is the abode; this is the abode; this is the abode.Sīmānam comes from the noun sīme which means boundary or the parting of the hair. Vidriti means the central fissure between the two hemispheres of the brain. See the attached figure that shows the top view of the brain. As we can see this ‘central fissure’ is the abode of ‘three’ chakras viz. the bindu chakra, which is the eighth (this is often overlooked in the popular books on meditation and yoga – it is the ‘hidden’ one), sahasrār chakra – the seventh and the ājna chakra – the sixth.
To elaborate, in the eastern context, a ‘point’ cannot be ‘zero-dimensional’. On the contrary, it is a concentrated microcosmic unit that unfolds to reveal all dimensions. It is like the enfolded string of the Unified field theory of physics today. Kalātattvakośa  elaborates on bindu giving citations from various Sanskrit texts as follows :-