Conception and the world the works about it. Since the Monada includes many-many worlds in the future the term "World" and "Monada" will be used separately to represent different things.
So the Monada is the space that contains all other Worlds.
The Chaos
The Chaos represents pure energy that makes up everything in this world. It has no particles and has infinite entropy. Rather it has no logic or the logic of it's working is to hard to understand for anyone, does not matter how much sentient and intelligent they are.
You can ask yourself: if there can be no logic in The Chaos then how would there be any worlds including ours? The answer would be an example:
Imagine you can get a completely random number from 1 to 100 and do it one hundred times. Of course at first you will get something like: 87, 13, 20 and so on. If you try again you will get 14, 8, 65 and so on up until 100 numbers. We see here no logic, right? But if we do it infinite amount of times we surely at least once will get the 1, 2, 3 ... 100. So imagine now we see only this one result without the rest. Would you assume there is no logic? Of course not. We see an obvious order of numbers going on here. But still, we got it from random numbers by trying it many-many times.
The same logic would apply to the worlds that exist in the Monada. In the infinite Chaos eventually will happen everything. It's one of a simple explanation for how impossible in our world things can happen in the worlds of Monada.
Clusters
As was explained before anything can exist in the Monada. But our worlds do not need anything. Who would be interested in some white nosie, right? To have some restrictions on how things work there are Clusters.
What is Cluster? Simply putting Cluster is a part of the Chaos where sentient creature could appear in some form and see some logic in the world around them for a steady amount of time. The need of sentient perceptive creatures is needed for those worlds because logic exists only in eyes of the spectator, as in the example with the number rows. In this context we can use analogy to the example: cluster-1 would the row of 1,2,3...100 and the cluster-2 would be the row of 3,9,27... and so on. So clusters can have different logic and physic laws.