Three understanding and three confusion

Three things I understood or interested in.
"We must make the assumption that in the world of play there are no accidents. Nothing occurs by chance. Nothing in the play is without significance. "In a play, every part in it must has their own meaning to the whole. Directors add each element into a play in order to show some meanings or want to make connections between part to part.  If you are actors, but in a show you accidentally move to the wrong place or do the wrong things. You cannot let the audiences figure out that is an accidence, you just need to continue acting.
 The stage would never obeys the same rules as ours, because  in its world, nothing else is possible besides what is there: no one else lives their. Actors need to action depend on the stage's situation, not depends on their own thinking.
To see this entire world, do this literally. Mold the play into a medium sized ball, set it before you in the middle distance. Make the ball small enough that you can see the entire planet, not so small that you lose serial, and not so large that detail overwhelms the whole. To adjust yourself in order to understand the whole planet in a open mind.
Three things I did not understand.
The puzzle may hold the key , be someone who arouse to meaning. I do not understand because is that means the questions always hold the answers inside.
There is a picture inside the article, but I did not get its meaning.
A play is not a flat work of literature, not a description in poetry of another world, but is in itself another world passing before you in time and space. Language is only one part of this world. Even though language is the part element of the show, but it is the most direct way to show to the audience about the characters' personalities. Then the author talked about some compositions of the planet, but those elements also need to be explained by the language. If language does not hold the most, which element composes the whole play.