Ultimately, we're not made of things but of processes; we're not objects or subjects, we are happenings.

Both subject and object are complementary aspects of an experiential process. The process is fundamental whilst the subject and object are virtual appearances.

The unified cosmic process (Brahman) has subject=God (Supreme Self) and object=quantum field (spirit world).

This unified cosmic process operates 'between' moments of existence; changing the state of NOW so that it seems that there are many successive moments.

As these moments blur together there seems to exist myriad individual experiential processes (Atman), which operate 'across' moments of existence.

This is how Atman is Brahman, depending on whether we contemplate the process as operating 'between' or 'across' moments. When 'between' it is One, whilst when operating 'across' it is many.

The individual experiential processes (Atman) have subject=Jiva (personal self) and object=Maya (phenomenal world).

In this way the unified cosmic process seemingly animates myriads of virtual processes, hence the One manifests as many. Many subjects (embodied beings) and many objects (physical universe).

But ultimately there is just one unified cosmic process, which can be known as either one subject (God / Supreme Self) or one object (quantum field / spirit world).

Anyway, that is one possible English interpretation of the mathematics that I intuitively received and have been contemplating since 2000. The maths is crystal clear and very succinct but it is hard to find words to describe it because words have so much egoic / materialist baggage attached.

Hope it makes sense to you...

BTW for much more detail see System Science of Virtual Reality.