May be the subject is new for the GD community, but it is not for the Rosicrucians. Since the first R+C manifesto in 1622, when the "invisible brotherhood" place their placards all over Paris, the subject of invisibility is on the table.
I am also noticing that there is some kind of difference in terms of approach to the practice of the Art. Let's take an example comparison between AMORC and GD. We may noticed that the GD teachings favours Ritual practice while AMORC approach the subject from the experimental point of view. In that sense, with GD rituals the mechanics of the phenomenon are hidden, while the AMORC 'experiment' favours the process by which the phenomenon takes place. May be that's the reason why the Invisibility hasn't gained much credit among GD magicians...
Taking the Invisibility practice, what GD offers is a ritual invocation pleading the god of appearances to hide the subject. The practitioner didn't know how it happens, hopping that the invoked god will take care of the process, while with AMORC teachings the practitioner learns what forces are involved and how to control them to achieve the desired goal. That method also has an advantage of improving the practitioner concentration skills and the ability to control the cosmic energy by the power of will. The consequences of the different approaches are obvious in relation to the psychic development of the practitioner.
For details about this exercise, from the AMORC point of view, refer to the book "Steve Richards - Invisibility" (it is available from the internet). The author quote the entire sections of the AMORC's 9th Temple degree on the Invisibility exercise, called the "Cloud of Invisibility".
Reviewing the exercise, you may noticed that it starts by the practitioner creating a cloud of pure energy by sheer concentration of the mind. Then they need to tune their skills to control the created cloud turning it into a spiral of energy. That is the real starting point for further experimentations/manifestations. At that point the practitioner have an incredible experience of the birth of the Universe. Only after several manipulations of that cloud/spiral of cosmic energy the practitioner is able to use its effects.
I would like to point out that Invisibility is a subproduct of that exercise. The real deal is about the practitioner to be able to develop their power of concentration manifesting matter from energy as well as creating a Portal do Higher Dimensions.
I would like to open a discussion regarding the concept of an Adept and its required preparation in an esoteric school settings like the Rosicrucian orders, not only AMORC but other Rosicrucian schools or orders as well.