Upon | Meaning of upon

See here, the meanings of the word upon, as video and text.

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upon (preposition)
Physically above and in contact with.
Place the book upon the table.

upon (preposition)
Physically directly supported by.
The crew set sail upon the sea.
She balanced upon one foot.

upon (preposition)
Being followed by another so as to form a series.
Hours upon hours, years upon years, mile upon mile of desert.

upon (preposition)
At (a prescribed point in time).
The contract was rendered void upon his death.

upon (preposition)
On.

upon (adverb)
Being the target of an action.
He was set upon by the agitated dogs.

Reference:
upon
January 24, 2019

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[jeonhyunrin]

So why they use upon as subject? I still don’t get it though.

[yashverma]

The hour upon hour spent but nothing happened