I’ve been learning about this and I think I’ve got a handle on it now.
1. Your ego made this world. ie, this physical world is ”the world you made.” You made it with your dreaming, and your making of it was based on TOTAL opposition to God, as the picture of the crucifixion of His son, as an attack on God. In effect, you made hell, which is equated with the lowest state of false perception. “The world is false perception”. Without the Holy Spirit, this world would’ve stayed in darkness as “hell”.
2. The Holy Spirit also co-made the world with you, because God (who could not join you in your insanity), still put His sanity in your mind. Holy Spirit “made” an alternative interpretation of the world, based on an alternative way of perceiving. This way of perceiving is based on forgivenss and love and is “true perception”. Jesus says that Holy Spirit’s perception can be considered “an alternative dream”.
“There is another Maker of the world, the simultaneous Corrector of the mad belief.”
“The ego made the world as IT perceives it, but the Holy Spirit, the RE-INTERPRETER of what the ego made, sees it only as a teaching device for bringing you home.”
So there’s two makers in your mind. “Heaven and Earth are both in your mind.” Depending on which one you perceive WITH, or how you choose to perceive, and thus project, determines what kind of a world you experience or whether it strikes you as justifying attack or justifying forgiveness.
“Corrected error IS the error's end. And thus has God protected still His Son, even in error. There IS another purpose in the world that error made, BECAUSE it has another Maker Who CAN reconcile its goal with His Creator's purpose.”
“In His perception of the world, nothing is seen but justifies forgiveness and the sight of perfect sinlessness. Nothing arises but is met with instant and complete forgiveness.”
You didn’t make or come into the world of hell alone. You dreamed of Hell, but Holy Spirit kept an awareness of Heaven - where you came from BEFORE you made the world - in your mind.
“Everyone here has entered darkness, yet no-one has entered it alone. Nor need he stay more than an instant. For he has come with Heaven's Help within him, ready to lead him OUT of darkness into light at ANY time. ”
Also this ties in with sin. Sin is the idea of irreversible real attack which has produced unforgivable consequences. Sin is therefore equated with false perception, and with the world as YOU made it, not the forgiven world that Holy Spirit made.
“Sin is the fixed belief perception CANNOT change. What has been damned IS damned and damned forever, BEING FOREVER UNFORGIVABLE”
“The Son of God could NEVER sin, but he CAN wish for what would hurt him. And he HAS the power to think he CAN BE hurt. What could this be EXCEPT a misperception of himself? Is this a sin or a mistake; forgivable or not? Does he need help or condemnation? Is it YOUR purpose that he be saved or damned?”
So this clearly gives us this simple structure:
WORLD #1: The world Holy Spirit made: true perception, forgiveness, innocence, happiness, love, healing, the forgiven world aka “the real world”.
WORLD #2: The world YOU made: false perception, unforgiveness, justified attack, sin and guilt and fear, pain and suffering, hell and nightmares, aka the “unforgiven world” or “unreal world.” I can’t even begin to imagine how horrifying the extreme of such a hellish world would be, but gladly we’re not experiencing it “at it worst.”
So when e.g. ACIM says “the world you made, it actually is specifically talking about the deeply negative self-attacking vengeful world - the physical universe - with all its cruelty anad suffering and competition and separation. You made it with your projecting (denial) which produced false perception.
Your task then is to move toward the Holy Spirit’s way of perceiving, so that you see the world HE made, or “in the way that He looks at the world you made. His interpretation of the world you made (hell) can view it in a heavenly way. As a teaching device to bring us home. That must mean learning to see this world not with false perception, but with the truth.
And because it is an illusory world, the truth reveals a recognition that it is “forgiven, yet false”. And it ultimately disappears once perception’s purpose is over. True perception must recognize that the world you made IS FALSE, because it was made AS false perception, WITH the idea of opposing God, and it is made FROM the separation idea. Failure to recognize it as false is whats give it seeming reality. Recognizing it as false is what helps you to see the truth about it, which is that IT IS NOT REAL - there is no world.
Personally I am still not *quite* clear as to whether Holy Spirit merely look at the world you made in a different way, or whether he literally has made “another dream” or “another world” entirely, in form. More to explore. Perception is tricky to understand.