Our revels now are ended. These our actors,

As I foretold you, were all spirits, and

Are melted into air, into thin air:

And, like the baseless fabric of this vision,

The cloud-capp'd towers, the gorgeous palaces,

The solemn temples, the great globe itself,

Yea, all which it inherit, shall dissolve,

And, like this insubstantial pageant faded,

Leave not a rack behind. We are such stuff

As dreams are made on; and our little life

Is rounded with a sleep.

William Shakespeare (1564-1616): The Tempest. Act iv. Sc. 1.