Having found a picture of the chair before it was sat on, this man did the world a favor. It looks like someone bedazzled a crappy chair with very over priced crystals. This chair trades on names like Swarofki and Van Gogh but has no artistic merit of its own.
And before some says "art is subjective" please note my subject view above.
In the Wyoming and Montana (Yellowstone) area we call these people "tourons" (tourist morons). Sitting on a priceless piece of art or petting a giant bison, it all comes from the same place. Profound stupidity driven by an unhinged sense of privilege.
I saw one where a lady jumped a guard rail and nearly stumbled and fell into the boiling hot spring she was trying to touch. Because I guess the steam and radiant heat wasn’t enough to tell her it was really fucking hot?
To me it appears that he didn't sit on it at first, but then changed his mind and sat down. I'm convinced that what you saw as him falling onto it is because he sat on it and then the legs buckled. The buckling caused him to fall further back, because the legs were stronger when they were straight.
The museum is mad that they left after that, but honestly I'd be pretty terrified going up to them and mentioning that I'd fallen into a priceless artifact and broken it. In theory, they didn't put up glass, and as professionals knew that means there's a risk accidents could happen. In practice, maybe they're short on funds and whatever bureaucrat sees suing me as a way out.
But the artist said he could see a “positive side” to the incident. “It’s like a kind of performance. Ordinary people can do it too, not just artists.”
My brother is one of the more intelligent and scientifically-minded people I know, but I'll never forget the time we went to the Detroit Institute of Arts and he got yelled at for touching too many exhibits.
It isn’t actually Van Gogh’s chair, that’s just the name of the piece. It’s described as having a delicate inner structure covered in crystals (probably a wire frame). It’s not a real chair, which is why it collapsed instantly – it wasn’t created to hold any weight.