"Some of them are shared illusions, and others are part of your personal hell."
It's a very common belief that there is only one dreamer of the dream of separation. This is not true.
Nor is it true that "the one son" dreamed the dream. Only individual portions of the sonship chose freely to entertain the idea of separation, not all of them. And some angels also bought into it and others did not.
The dream has MANY AUTHORS. This is possible because we OVERLAP, because we share minds. So there can seem to be one dreamer or it can seem in an awakened experience that you are responsible for "all of the dream", but *ALSO* others are responsible for all of the dream as well! You overlap, you share, you collaborate, you join wills and join forces and this world was made by MANY MINDS.
The misunderstanding of this, due to poor reasoning, has led to many people to be CONFUSED and to adopt beliefs about what ACIM is teaching that are mistaken.
For example, people say "other people are me" or "we're all one person" and therefore, this leads to conclusions like... I am responsible for what other people are doing. Or, I must be responsible for making someone sick. Or, if I change my mind about the dream, it will automatically somehow magically "heal" everyone and all of the sicknesses will magically disappear and I'll be looking at a world where everyone is healthy and happy. NOOOO. That does not happen.
You waking up as "author" of this dream only means that you are a CO-AUTHOR, and you've waked up from the PART you played in its making. This is why Jesus was able to wake up FIRST without others waking up, and it's also why you must accept atonement for YOURSELF. Many individuals have to accept the atonement, otherwise if "one" of them accepted it, it would literally be instantly accepted for all, and we wouldn't be sitting here 2000 years after Jesus atoned still deciding whether or not to wake up.
This has led to some quite distorted conclusions about what needs to happen to your perception in order to produce a forgiven world or a happy dream or a world without sickness or bodies. It makes people OVERLY responsible for the choices of other FREE WILLED INDIVIDUALS. This is actually a fault, because YOU are supposed to be claiming and taking full responsibility for what YOU are choosing or doing to yourself, and you can't DO that if you're telling yourself that you are responsible for the other PARTS and CAUSES that are in the world. If you tell yourself, you're responsible for someone else's choice to die, because it's so-called "your dream", then you're going to be in for a surprise.
This has also led people to conclude that when Jesus was performing miracles, he somehow "did not see" bodies or was not able to discern "sickness" at all, and they've justified and rationalized and explained this away as some strange twist of perception, that he could not SEE what was "wrong" with them and could not tell that they needed help. This is CLEARLY not in accord with what ACTUALLY happens in experience, and even people who have had awakenings through ACIM have said that they still can SEE. Perception merely becomes MORE ACCURATE, it doesn't make you BLIND to what OTHER PEOPLE ARE CHOOSING.
Miracles would not be able to supply a lack to those who temporarily have less from those who temporarily have more, if we did not have free will. There could be no teachers or students or people meeting to learn lessons. There HAS to be a provision for individual choice, in terms of what YOU are responsible for and what OTHERS are responsible for.
This is why Jesus says that when you accept the atonement for YOURSELF, you become part of the atonement and then must go help OTHERS. Many people now believe that when you accept atonement you are accepting it as "the one son" and therefore it ENDS the whole process, the dream disappears and "your dream" exists no more, therefore you're done with your task. This is NOT what happens. You become part of the atonement PLAN, and you must then go HELP OTHERS, help those who HAVE NOT YET ACCEPTED IT. This is only possible because everyone has free will and because we are CO-CREATORS of this dream.
You can wake up from YOUR dreaming or your BELIEF IN the dream being real, but that doesn't mean other people have woken up, it does not force them to wake up, nor does it mean the dream is over. The only reason people have come to believe that there is ONE DREAMER or ONE SON is because of FALSE TEACHINGS that have been perpetuated about the course, from even the most famous of teachers. It makes sense to the ego, but the ego is insane, so it is nonsense. It also is based on denial of souls and individual free will, which is the underlying foundation for WHY what other people choose is NONE OF YOUR BUSINESS.