Here is a very interesting paragraph from ACIM:
"The world is false perception. It is born of error, and it has not left its source. It will remain no longer than the thought that gave it birth is cherished. When the thought of separation has been changed to one of true forgiveness, will the world be seen in quite another light; and one which leads to truth, where all the world must disappear and all its errors vanish. Now its source has gone, and its effects are gone as well."
Notice that it leads off by saying that the world *IS* false perception. In the mind of Christ, in whose mind the entire physical world is imagined, the world itself IS false perception. Not a false perception OF the world, but that the world itself is a state of perceiving falsely.
This also adds weight to the fact that when perception is corrected and undone, at the christ level, the illusion of a world MUST disappear from the mind of the Son of God.
We work on correcting perception believing that it is our own private, separate perception, our own little mind in our own little body. But Jesus clearly references perception as the imagination of the One Christ, in which the entire physical universe is his imagination at work. The world IS made of thought, and it WILL disappear when the mind of Christ has entirely awoken from all dreaming.
We can work on correcting our own private perceptions, but we cannot stop there. The perception which has visualized the entire world must also be corrected. What is "out there" is MIND STUFF. Thought. Its physicality is an illusion, and all of it can be changed.
This once again confirms for me that some parts of the course apply at the 'I am one body with a little mind' level, and some parts apply at the 'I made the entire universe with a huge mind' level. I think that many of us ACIM students are falling WAAAAAAY short of what the Course is teaching, when try to fit everything into the little "I'm one little mind" level, body-identified, not realizing the HUUUGE implications of the power that we have over the entire world. The Christ-level of awareness is unlimited in its power and has dreamed the entire universe, having more than enough power to undo it in its entirety. The physical universe IS a state of perception IN the christ mind at a universe-sized scale. AND we are being asked to step into those massive shoes by Jesus, shoes which perform extraordinary supernatural miracles!!