The symbols of the Vision are important to -factually understand- some supermental process now taking act on earth, not any future time, but this very moment.
On my understanding, the shift between the Square and the Cube, is real.
It is difficult to explain, I´ll try to make it simple.
Imagine that you are the symbol of Sri Aurobindo,
because everybody is symbolized there, not only him. It is a process.
Now, what you are looking at it is "abstract knowledge" of the process.
Which process? The manifestation of the supermental light as far as you are concerned.
But this abstract knowledge needs to be vivified by the true realization.
We need to became the Cube. Which is the true meaning of the square, its secret soul.
Savitri enters the Cube when the Cube is there, not before.
So there is the need of a shift, for us, from square (abstract) to cube (real).
From dimensionality to multidimensional, from the symbol towards what is represented by the symbol, as much the cube is represented by the square.
The triangles (and pyramids) which appear in the emblems above are not mere result of tracing lines, they represent the four elements and their action, their presence is fundamental because without them life would be impossible. They require our attention, I dare to say we have to become masters of the elements, we are intimately a melange of them expressing the characteristics of one of them as a main feature, often they are out of balance in our own system, and the mastery of them is the alchemical work, in which we alter the dominant direction of each element allowing them to enter in balance with their own counterpart.
An example: the fundamental direction of the water is downward, the alchemical work makes that water rise upward, it do not eliminates the previous direction but completes it with its ethereal counterpart.
The Cube appeared, as you know, in the Vision of Savitri, a vision I share as by request from Sri Aurobindo himself, who allowed me to witness with the purpose to be communicated.
This image reproduces your planetary being with your central sun, it is also the way the cosmos has an influence on us. How above so below, said the ancient. This means in your body there is the representation of the solar system, were the Self is the sun.
Astrological influences came within this perspective as it is a microcosms and a responsive centre.
Another point is the concrete relation with the Elements, as Elements are the archetypal bringers of any transformation.
We could truly say that the undifferentiated light differentiated in Elements so to interact and create life.
And this physical body is very susceptible at any action of the elements.
From the Vision we have seen there is an interaction of Elements previous to Savitri entering the Cube.
You have seen how the water, which direction is earth-directed, inverts its direction. This inversion of one element necessarily affects the whole of the equilibrium of the other elements, so it produces a total reversion of each direction: if the water ascends, the fire descends, and if the earth rises the air is below.
