Fun I love but too much Fun is of all things the most loathsome. Mirth may be happy in This World. And I know that This World Is a World of Imagination & Vision. I see Every thing I paint In This World, but Every body does not see alike... The tree which moves some to tears of joy is in the Eyes of others only a Green thing that stands in the way. Some See Nature all Ridicule & Deformity & by these I shall not regulate my proportions, & Some Scarce see Nature at all. But to the Eyes of the Man of Imagination Nature is Imagination itself. As a man is So he Sees. As the Eye is formed such are its Powers. You certainly Mistake when you say that the Visions of Fancy are not be found in This World. To Me This World is all One continued Vision of Fancy or Imagination.....  

--from 'To the Rev Dr. John Trusler'; William Blake (1799)