What is detailed interpretation of this passage from The Great Gatsby ? (I need help with explaining "frightening leaves" "grotesque rose" "sunlight" "grass" " a new world""poor ghosts", why wilson is "ashen figure"?)

He must have felt that he had lost the old warm world, paid a high price for living too long with a single dream. He must have looked up at an unfamiliar sky through frightening leaves and shivered as he found what a grotesque thing a rose is and how raw the sunlight was upon the scarcely created grass. A new world, material without being real, where poor ghosts, breathing dreams like air, drifted fortuitously about...like that ashen, fantastic figure gliding toward him through the amorphous trees

Explanation:

The paragraph given in question statement is from Chapter Eight. Starting from the line given, Nick has told himself that he couldn’t sleep because he is strangled "between grotesque reality and savage frightening dreams." Nick told that just as rose has an image of its beauty, so is Daisy “grotesque” in the same way. Gatsby has invested her with beauty which is the center of his dream.

Gatsby has lived "too long with a single dream"; without this dream, his life has become bizarre. In this new world, a world without his dream, Gatsby noticed a rose is just a rose and a green light is not more than a green light. So now Gatsby has been forced to grow up and the world seems im-material to him

it was surely an odd creature that one made up by reading the historians first and the poets afterwards a worm winged like an eagle; the spirit of life and elegance and charm,   in a kitchen chopping up suet. but these creatures, monst'r however entertaining to the imagination, hast no existence in fact. what one might doth to bringeth h'r to life wast to bethink poetically and prosaically at one and the same moment,   thus keeping in toucheth with fact—that the lady is mrs martin, ag'd thirty-six, did dress in blue, wearing a black coxcomb and brown shoeth; but not losing sight of fiction eith'r—that the lady is a vessel in which all s'rts of spirits and f'rces art coursing and flashing p'rpetually. the moment, howev'r, yond one tries this method with the elizabethan mistress, one brancheth of illumination fails; one is did hold up by the scarcity of facts.   one knoweth nothing detailed, nothing p'rfectly true and substantial about h'r.   hist'ry scarcely mentions h'r.   and i did turn to professeth'r trevelyan again to seeth what hist'ry meanteth to that gent.   i hath found by looking at his chapt'r headings yond t meanteth.