Forms, forms, forms, forms. Objects, stuff. Choices, options. Things.
It's incredible how it is possible for a slight change in the form of something seems to give us enough reason to believe that it is 'different' and 'unique', that we accept it as though it is completely new.
The ego world has a huge wealth of scope for including countless variations of forms. All of these forms present the same ILLUSION, that the 'form' something takes determines what it IS.
The truth is, that a different form is actually an illusion designed to make you believe that there are a) many problems, b) a great amount of isolation, c) things which don't apply to other things, d) value in different forms, and many other side effects, all of which support and sustain the ego thought system.
The deception that different forms really ARE different, is the ego's main play in this world. There really is no difference between, e.g. a chair with a curved back and shiny chrome legs and a certain shape of seat, versus almost the exact same chair in a slightly different color with a slightly less rounded seat. I mean... its enough for us gullible fools to believe, oh yes, look, there are DIFFERENT ONES.
And then you go about choosing between these subtle differences as though they are really, really important. I will choose the red one with the slopey back, instead of the orange one with the slightly more squared-off seat. Success!
We have a gross paralysis in life because of this. There are thousands of tv channels with nothing to watch. There are millions of products to buy and none of them are fulfilling.
After a while of seeing this, of seeing THROUGH this illusion, life starts to look a lot less deceiving, and at the time, you could say somewhat more boring. You start to realize what the Course says, "this world holds nothing that I want".
It's really all to do with searching outside of ourselves, to replace the emptiness that we have inside, due to unawareness of God/Self.
When we want God, we want God more than we want the world. And then we can recognize that all 'forms' (which the Course refers to btw as FORMS OF ERROR because all form comes from separation), are really the SAME ILLUSION, presented in a different variation. It's like, learning that all objects with 4 wheels are 'cars', and no longer believing that there are many distinct separate objects in the parking lot. It's a matter of abstraction.