Sometime we see a cloud that's dragonish:
A vapor, sometime, like a bear, or lion,
A tower'd citadel, a pendent rock,
A forked mountain, or blue promontory
With trees upon 't, that nod unto the world,
And mock our eyes with air: thou hast seen these signs;
They are black vesper's pageants.
SHAKS.: _Ant. and Cleo.,_ Act iv., Sc. 12.