The fact that you state that "an invitation to test the boundaries" and focus on the razors and nails says something about you (and probably humanity in general as well).
If you were present then what would you have done?
After all you could have given her a hug. Or used the feather to make her laugh.
There were nice things on the table to choose from.
But yeah, I'd probably have done something not so nice as well. But why is that?
I think the point is that the objects provided have a large influence on the actions of the audience. If there were only feathers and face paint I would think the outcome would have been very different. Keeping that in mind might change what conclusions someone takes away from the whole thing.
"Here's some razor blades and nails, do what you want, I am an art piece!"
Everyone immediately thinks "well I guess she wants us to test her with this stuff"
It's more of a stunt than anything... and since everything and anything can be art... sure... But I'd rather call it a stunt