What is important to Gatsby as he gives Daisy a tour of his home? Why?

In Chapter 5 of The Great Gatsby, Gatsby gives Daisy and
Nick a tour of his empty house.  Nick had only been to Gatsby's for the parities, and
now he sees it empty for the first time.  To him, it is a haunted
mansion:

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It was strange to reach the marble steps and find
no stir of bright dresses in and out the door, and hear no sound but bird
voices in the
trees.

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And inside, as we wandered through Marie
Antoinette music-rooms and Restoration salons, I felt that there were
guests concealed behind every couch and table, under orders
to be breathlessly silent until we had passed through. As Gatsby closed the door of “the
Merton College Library.” I could have sworn I heard the owl-eyed man break into
ghostly
laughter.

This emptiness
symbolizes the relationship that Gatsby has with Daisy: it is not a re-kindling of the
past.  Rather, it is a vain attempt to resurrect
ghosts.

Later, Gatsby tries to impress Daisy
with his shirts.  The colors are dizzying:

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He took out a pile of shirts and began throwing
them, one by one, before us, shirts of sheer linen and thick silk and fine flannel,
which lost their folds as they fell and covered the table in many-colored disarray.
While we admired he brought more and the soft rich heap mounted higher—shirts with
stripes and scrolls and plaids in coral and apple-green and lavender and faint orange,
and monograms of Indian blue. Suddenly, with a strained sound, Daisy bent
her head into the shirts and began to cry
stormily.

Remember,
Daisy's voice should be full of money, and Gatsby appeals to it, but she begins to cry.
 Gatsby mistakenly thinks these are tears of joy of having been reunited with Gatsby.
 But, Nick and Daisy know that these are tears of sadness, as she is
mourning what has been lost. They know that she can never relive the past
and that this relationship is fruitless.