At the beginning of Canto Four of his poem John Shade (the poet in VN’s novel Pale Fire, 1962) says that he will spy on beauty as none has spied on it yet and mentions two methods of composing, A and B:
Now I shall spy on beauty as none has
Spied on it yet. Now I shall cry out as
None has cried out. Now I shall try what none
Has tried. Now I shall do what none has done.
And speaking of this wonderful machine: