No matter how original you think you are, David Bowie did it first.

Chicago Mayor Rahm Emanuel officially proclaimed Sept. 23 as "David Bowie Day" in honor of the rock star's retrospective exhibit, David Bowie Is..., opening that day at the Chicago Museum of Contemporary Art.

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The exhibit will feature more than 300 items from the rocker's personal archives — including clothes to hand-written lyrics and set lists, as well as diary entries from his teen years until his retirement from the music industry. It's a glam fan's sparkly dream come true.

But it's not just Chicago who should pay tribute to the legendary star. Throughout all this rock chameleon's ch-changes, David Bowie has always been about one thing: originality.

You'll want to write a big thank you card for all the wonderful things Bowie has bestowed upon the world. Just make sure you have plenty of glitter.