Giving to airy nothing a local habitation . . .

"Lovers and madmen have such seething brains,
Such shaping fantasies, that apprehend
More than cool reason ever comprehends.
The lunatic, the lover, and the poet,
Are of imagination all compact;
One sees more devils than vast hell can hold,
That is the madman; the lover, all as frantic,
Sees Helen's beauty in a brow of Egypt;
The poet's eye, in a fine frenzy rolling,
Doth glance from heaven to earth, from earth to heaven;
And, as imagination bodies forth
The forms of things unknown, the poet's pen
Turns them to shapes, and gives to airy nothing
A local habitation and a name."
Thesesus -- Act V, Scene 1 -- A Midsummer Night's Dream