In the section below, Jesus writes about how God did not create a meaningless world, God only creates things which are meaningful, and the world we see (earth etc) is not meaningful, and therefore does not exist, because God did not create it. For example he even gives examples of things in this world which God did not create and are therefore not real:
"God did not create that war, and so it is not real.
God did not create that airplane crash, and so it is not real.
God did not create that disaster [specify], and so it is not real."
This means not only are your personal perceptions and interpretations of the world not real, it also means the stuff IN the world, the wars and airplanes and disasters and so on ARE NOT REAL, so they DO NOT EXIST AT ALL, regardless of how you are looking "at" them. Looking at a plane crash in a "happy way" is denial of the fact that there IS NO plane crash, and that isn't to do with your personal private perception, nor is it really to do with your interpretation of way of looking at the plane crash. It's on a much bigger scale, of the fact that there is no plane or crash whatsoever because it doesn't exist, and the plane and the crash are PART OF YOUR MISPERCEPTION.
He goes even further to tell us that the illusions we "see", some of them can be part of our "personal hell", while other illusions are "shared".
I think this is an important point because "perception" is not just about your own personal hell within your own mind. And accepting atonement is not just about you becoming happy with a horrifying world of death and destruction, sitting on a fence smiling at passers by who go about their torture. Some aspects of perception are also taking place on a shared level, outside your body, and in "forms" which are actually parts of your perception as a much larger being/mind, shared with other minds as part of the sonship who is dreaming this whole world.
Many people think the Course is only about fixing your "personal hell" ie the illusions or perception that are "inside your own mind". This is only PART of the truth. A big part of the illusions which need correcting are OUTSIDE your personal mind, in the larger mind which we collectively are contributing to, and which encompasses this whole universe. This is why Jesus says "this world IS perception".
Whenever Jesus talks about "the world you see" many people have interpreted it to mean he's referring to your personal private interpretation of the world, as though an imaginary world that you overlaid on top of the world. This correlates to many passages in the course about false perception and seems to give it credence. But it also misses the point that Jesus is quite plainly referring to THE PHYSICAL WORLD not just your personal interpretation of it. The world you see, this universe, does not exist. The world you see, this universe, which is not "inside" your little mind, but is part of a collective shared mind, needs to be "corrected" because IT is perception.
Objects and clouds and rocks and people and mountains and rivers and trees and dogs and cats are all part of this illusion, and all part of perception, and all part of your mind. Not just the stuff that seemed to be inside your personal space.
"God did not create a meaningless world.
The idea for today is, of course, the reason why a meaningless world is impossible. What God did not create does not exist. And everything that does exist exists as He created it. The world you see has nothing to do with reality. It is of your own making, and it does not exist. "
"This is your personal repertory of horrors at which you are looking. These things are part of the world you see. SOME OF THEM ARE SHARED ILLUSIONS, AND OTHERS ARE PART OF YOUR PERSONAL HELL. It does not matter. What God did not create can only be in your own mind apart from His. Therefore, it has no meaning. In recognition of this fact, conclude the practice periods by repeating today's idea:
God did not create a meaningless world."