The Van Gogh immersive experience is not at the Art Institute. And as far as I know they are not associated, so yes you do need separate tickets to the Art Institute.
I don't believe the Van Gogh experience is in the museum. I was just there Saturday. Check the Van Gogh experience location.
The Van Gogh Experience isn't relayed to the art institute, so you do need sperate tickets yes.
The Art Institute has several Van Gogh paintings but do not have a Van Gogh experience.
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