Quantum Limmericks

Ronald Knox:
There once 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."

Bishop Berkeley:
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.