There's a fun Limerick by one Robert Knox inspired by one of Berkeley's arguments about what happens to objects when they are not being perceived:

There was a young man who said, "God

Must think it exceedingly odd

If he finds that this tree

Continues to be

When there's no one about in the Quad."

REPLY

Dear Sir:

Your astonishment's odd:

I am always about in the Quad.

And that's why the tree

Will continue to be,

Since observed by

Yours faithfully,

GOD.

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