At once, far off... begins a rumbling, droning noise -- like a thousand distant flying machines -- like the sound of an armada of mechanical birds --… - Peter Greenaway

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At once, far off... begins a rumbling, droning noise -- like a thousand distant flying machines -- like the sound of an armada of mechanical birds -- a noise reminiscent of implacable, massive stage machinery in a masque or pageant that is several streets away. It is not one sound but many sounds combined. This is the sound of Prospero's magic.