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When one's surface flat, then below has a hole
Where fallen leaves may endlessly patrol
Like a witches hat, standing on end
Deep space cousin causes time to bend
From many things together must go
Submerged travel agent of Toto

What am I?

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This sounds like a description of a

whirlpool, perhaps in a swimming pool.

When one's surface flat, then below has a hole
Where fallen leaves may endlessly patrol

Sounds like a reasonable description of a (currently unused) swimming pool. Could be a pond or lake instead, but they'd be less likely to have a drain.

Like a witches hat, standing on end

This is approximately the shape of (the "air" portion of) a whirlpool.

Deep space cousin causes time to bend

A spinning black hole has some similar properties, and the traditional rubber-sheet representation of a two-dimensional version will have a similar shape.

From many things together must go

I don't have a good explanation for this line.

Submerged travel agent of Toto

A whirlpool is like an underwater version of a tornado, as seen e.g. in The Wizard of Oz. (Toto is Dorothy's dog.)

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  • $\begingroup$ I think you got it! $\endgroup$ – Rand al'Thor Sep 5 '16 at 15:29
  • 1
    $\begingroup$ Apparently there isn't universal agreement about this :-). $\endgroup$ – Gareth McCaughan Sep 5 '16 at 15:29
  • $\begingroup$ The toto line really narrows it down $\endgroup$ – Beastly Gerbil Sep 5 '16 at 15:30
  • $\begingroup$ Will had a comment earlier saying he thought it should be something broader, and posted an answer which he's now deleted. If the intended answer turns out to be something strictly more general than my answer (which it might well do), let the record show that Will got there first. $\endgroup$ – Gareth McCaughan Sep 5 '16 at 16:11

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