Magus Of Possibilities

If Reality Marble is about the materialization of one's inner world then marble phantasm is about becoming one with world don't misunderstand

It can be summarized in one word Adoptability, it starts from the moment that we defined the world

and from the moment we found our answer. To call the marble phantasm as manifestations of a phantasm is to imply that it is about the miracles of nature such as seasons so it can't do anything outside of nature

The concept works on "clustering illusion" theory of probability. Much like a mathematical metaphor involving drawing a white marble from a bag of black marbles with a one percent chance, Marble Phantasm is the ability to raise that chance to one hundred percent and definitely pick the white one amongst all the black ones. This remains within the laws of the world, but similarly, a Reality Marble would allow for all of the marbles to turn into white ones which is why it would require more prana to activate and sustain it's existence because yhis is something the world wouldn't naturally allow and can only specialize in that one aspect.

It can be considered more efficient while Marble Phantasm can perform any number of things but Reality Marbles can also affect things not of nature, so they can also be called superior in that sense.

It works by synchronization with the world as a means of interfering with probabilities, and transfiguring the surrounding world at will, in accordance to their vision of the world. 

Note World so it about something related to natural phenomenon such as snow etc not reality meaning it can't do things outside of nature only that is taken to the extremities that is why it can terraform it's range

Like a reality marble it has a spherical boundaries which is why both reality marble phantasm and reality marble contain the word marble in the general classification of the said ability

We all live in the same world so why is that it's manifestation is different from each users

The answer is World and Nature

World meaning it is bound by it's rules and nature as it's defining trait which aspect of the world should it be it's foundation

Nature and Marble Phantasm

it's impossible for all to think one-hundred percent the same way. It's just impossible.

That's why the counter force is divided by Gaia and Alaya which can never truly know the meaning of the world, not as long as something called perception exist.

That's why all marble phantasms are different from one another, because everything is fundamentally different both in nature and existence. We define them as concepts such as snow, water, seasons etc and we all have our own perception.