So you couldn’t wangle your way into the press preview. If you’re active on social media, you probably already feel like you’ve seen the Whitney Museum’s “Jeff Koons: A Retrospective” in its entirety, thanks to the army of Instagrammers documenting Koons, his art, and all the related fanfare. With the addition of his massive Split-Rocker installation in Rockefeller Center, Koons Fever has officially gripped New York City, and we’ve got the pictures to prove it.