Bb thinks it is distinct.
That’s the Bb near middle C.
The uppermost Bb also thinks it is distinct as do all the other notes.
They don’t see themselves the way the pianist does.
The pianist sees them all just as notes.
But doesn’t see the invisible quarter tones (who also believe themselves distinct)
Best of all the pianist also believes them self unique. What does that mean for every leaf on the tree that wants to own a home?