Yet all experience is an arch wherethrough Gleams that untraveled world whose margin fades Forever and forever when I move. How dull it is to pause, to make an end, To rust unburnished, not to shine in use! As though to breathe were life!
Come, see the north-wind's masonry, Out of an unseen quarry evermore Furnished with tile, the fierce artificer Curves his white bastions with projected roof Round every windward stake, or tree, or door. Speeding, the myriad-handed, his wild work So fanciful, so savage, naught cares he For number or proportion.
You must not know too much or be too precise or scientific about birds and trees and flowers and watercraft; a certain free-margin , or even vagueness - ignorance, credulity - helps your enjoyment of these things.