3, 6, 9...Tesla said "“If you only knew the magnificence of the 3, 6 and 9, then you would have a key to the universe.” I have done a lot of research on this type of abstract thought. It basically boiled down to energy/field/consciousness, which equates in to electricity/magnetism/consciousness, that made up Trinity. Energy is your divine spark, and field is the area you exist within. The 2 things that allow consciousness to isolate itself is electricity and magnetism. NOTHING in the physical universe exists outside energy and field...only then can you have consciousness reside inside a material existence.
But, I do not know why (no one does apparently) why Tesla said 3,6,9 was the key to the universe. I think it has to do with the Fibonacci series which provides the blueprint for this octave of existence.
Now, cat in the box is DEFINITELY a reference to Schrodinger's Cat. This states that the Observer is the creator of reality. This is a quick copy and paste from Wiki - Schrödinger's Cat: A cat, along with a flask containing a poison and a radioactive source, is placed in a sealed box shielded against environmentally induced quantum decoherence. If an internal Geiger counter detects radiation, the flask is shattered, releasing the poison that kills the cat. The Copenhagen interpretation of quantum mechanics implies that after a while, the cat is simultaneously alive and dead. Yet, when we look in the box, we see the cat either alive or dead, not both alive and dead.
Basically, the cat, as long as it remains in the box without an observer, remains in a state that is both alive and dead at the same time. Once the box is opened, it is the observer that collapses 'probability' and creates the actual reality...
You are getting into the quantum. Basically, light acts as both a wave and particle, at the same time. This goes back to Schrodinger's Cat. Do not observe the light, and it behaves as both a wave and particle. In physics, this is impossible. But, when an observer 'observes' the physics experience, it only behaves as one of the two...either a wave, or a particle...not both and once. Again, light, without observation, exists as 'probability'. This is the Bell Curve. But, once an observer is introduced to observe the experiment, light behaves as one or the other, and never both.
BTW, light is what makes up EVERYTHING. But, we'll have to go very deep to explain that.
ALL of this means, at its root, is the Observer (consciousness) collapses all probabilities...the collapse of probabilities is equated to...REALITY.