So, what if next the question went to Metaphysics?
How does Magick work and what's this universe thing anyway? Let alone minds.... Obviously difficult questions
The resource that was recommended to me and that I would also recommend is the Kybalion. Especially Chapter 5, which argues for the following conclusion: "Following the Principle of Correspondence, we are justified in considering that THE ALL creates the Universe MENTALLY, in a manner akin to the process whereby Man creates Mental Images."
http://www.kybalion.org/kybalion.php?chapter=V (to read the rest, click on the "contents" in the top right corner -- I spent a while looking, probably I'm getting to old for today's webdesign

)
In a subgroup on FB, I wrote my interpretation of this, which covers how Magick works in my view and what our relationship with the universe is. So here come my answers, for what it's worth
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This is my understanding of "Khaos Magick":
By the word "Khaos" I mean "a primordial origin-point, a gaping abyss derived from Greek lore from which the Gods and everything else stepped forth." (Frater Alysyrose) This serves as a name for the Root of all Phenomena.
The Universe is the Thoughts of Khaos (following the Kybalion's "The All" and it's mental creation). The future -- what is not decided yet -- is thus determined by the
ongoing thoughts of Khaos. The Root of all Phenomena
maintains the Sum of all Phenomena (the Universe) -- hence "Khaos provides"
This concerns everything, including things like the vast amount of space which contains almost nothing, galaxies with no conscious observers etc.
Now comes the twist:
We too are such thoughts -- and what's more, we have our
own thoughts. Our minds are
parts of the Big Mind of Khaos. This means that our thoughts are also
its thoughts. So we naturally play a role in determining the future, get a fragment of the
decision power so to speak -- and this is my answer to how Magick works

In Magick, we decide on some intent -- "This happens". Now, the more of our mind-fragment's resources we put into this decision -- the more intent/concentration/energy we give it -- the more likely it becomes that the future turns out that way

This is where Occult research comes into play -- to find out
how is this actually to be done.
[Edit 15.12.18 – I suspect that there is no theoretical "how". Just infuse your intent with magick – however that feels for you – and practice it. How to lift a weight? Just lift it, you
already have muscles. Lifting is a natural skill and so is magick. Some weights are too heavy though, so you have to train on lighter ones first. There is only your intent and Magick itself, no intermediaries.]
All minds together create the future states of the Universe, one after the other. Where intents
conflict (as with two wizards battling for the last cookie, to use Arjil's example),
the outcome with more energy poured into it manifests. (This means that the relatively inflexible "Laws of Nature" must be powered by some pretty large part of "Khaos Undivided", so to speak)
On this view, life is a
contest of wills with other similar minds and whatever drives the "physical world". Thus "uncontested" chunks of reality are easier to manipulate -- I can make myself cheerful easily because no one puts energy into wanting me to be sad and it's not hard on the laws of nature. However, I can't just win the lottery, because it's highly contested by other minds and correctly predicting the complicated trajectory of the lottery machine is physically improbable. This is the gradient on which intents fall with regards to difficulty.
However, that does not mean that we have to treat the universe an an enemy from which energy must be wrested. Khaos
chose to think of Magickal beings. Thus it
wants Magick to work. So one needn't
force the energy that surround us everywhere (the elements, prana, whatever) -- one can instead
ask it for
cooperation. This, I guess, I another meaning of Khaos provides

[This point is inspired by an acquaintance's opinion on working with the elements, thanks!]
This view -- to me -- is succinct, explains what we are seeing and "predicts" (alas post-hoc) what we are not seeing. Of course, it totally depends on the heavy premise of "The Universe is the Thoughts of Khaos"

However, "Everything is mental" seems to be the only way to explain quite a lot of stuff... (Side note: This view also seems nice on Spirits, from Servitors to Gods -- they can simply be separate mind-fragments or (shared?) "subdivisions" of other mind-fragments.)
What do you folks say

?
(Main inspirations for this are Arjil, Alysyrose, Peter Carrol and the Kybalion)