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Bishop Berkeley espoused the school of thought called Idealism, which went along the lines of: "To be, is to be perceived". One fyne day he dreamt the following conundrum up: "If a tree falls in the forest and no one hears it, does it make a sound?" The implication is that if no one perceives the event, not only does the tree not make a sound, but the tree does not even exist.

This is, of course, a load of old rubbish. The good Bishop can't do me for defamation since he ceased being perceived in 1753. Had he lived in today's more cynical world, he may well have come up with more relevent thought-experiments to illustrate the philosophy of Idealism, thus:

 

If a tree falls in a forest:

 


For Information practitioners:


For Theoretical Physicists:

 

For hard-bitten divorcees: