Well... the two pineapples. That's a little tricky. Depends on
how you look at it. We're humans. We compress knowledge in our
brains because we're incapable of bringing into us all the
uniqueness of existence into our tiny little minds.
So, however it works, we compress our sensory data into
patterns.
These patterns are expressed as simple lines cognitively, filled
in with colors, matched together as best as our brains can do.
We represent these patterns we humans use to comprehend reality
with utilizing categories, a stereotyping of reality.
Example:
These is something in front of me.
I do not know when they were planted and grown. I do not know
the age. I do not know when they will rot. I do not know the
molecular configuration of them.
I look at them. My brain cannot comprehend them in their
uniquenesses because I don't have enough data to work with. I
don't have the cognitive capacity to do so. But, the L4 (or is
it L5?) in my brain traces an "outline" quickly. It compares
them using a NOR "circuit" (not really a circuit - that's a
metaphorical connection - brains are brains, computers are
computers, computers are based on brains, which we often
forget).
The line-shapes don't overly conflict making an acceptable
compression algorithm possible.
Suddenly, I have two of something.
They are unique yet we humans make them similar because we must.
We're not capable of taking in the Universe in its uniquely
continually changing states. We have to stereotype.
So are their two pineapples? For humans? Yes. For lifeforms with
numerosity, Yes.
But for an electron? No. For a moon? No.
Do I see 2,393,934,209,384 unique quantum configurations in this
thing reflecting colors towards my retina and 2,494,383,209,391
unique quantum configurations in this other thing reflecting
colors towards my retina?
No. I can't.
Therefore, I must compress reality to fit my brain.
Therefore, I must have 2. I can't have a whole bunch of uniques.