What does the phrase " a tale, told by an idiot" refer to?

Life

Theater

Writers

Murder

The phrase " ... a tale, told bye an idiot" refers to life. Macbeth after being told of his wife's death, he says:

Life is but a walking shadow, a poor player

That struts and frets his hour upon the stage

And then is heard no more. It is a tale

Told by an idiot, full of sound and fury

Signifying nothing.

In other words, life is nothing but meaningless due to the facts that it isnt that long.