The latter must have been thrilled. Even though he did not like the uncertainty principle (God does not play dice). The thought experiment became known as "Schrödinger's cat". Since you cannot know both a particle's position and its speed -and that's just one example-, you have to assume all possible outcomes are valid (superposition). Only when you "look" does one particular outcome become the "reality". It's all part of the subatomic "world"
Wikipedia: "In Schrödinger's original formulation, a cat, a flask of poison, and a radioactive source are placed in a sealed box. If an internal monitor (e.g. a Geiger counter) detects radioactivity (i.e. a single atom decaying), the flask is shattered, releasing the poison, which kills the cat. The Copenhagen interpretation implies that, after a while, the cat is simultaneously alive and dead. Yet, when one looks in the box, one sees the cat either alive or dead, not both alive and dead. This poses the question of when exactly quantum superposition ends and reality resolves into one possibility or the other."
As I'm trying to explain this, I very much have to wonder if I get it right.
And I always thought that follows the uncertainty principle too: I can understand it and not understand it both at the same time.
A physicist might fare a bit better, but it won't come easy...
This is what I was thinking of with regards to the war in Ukraine.
Before the fighting started, all possible outcomes seemed equally possible. If you did not look too closely at numbers of soldiers and weaponry, that is.
But once it did start (when Schrödinger's box was opened), it became clear very rapidly that Ukraine had no chance of winning.
So why are we still acting as if the box remains closed?
Because that way we get to spend billions more on armory, and we get western people to support Zelensky and his neo-nazis as those same people suffer from high prices for everything.