All my art is in the public domain. You can do whatever you please with all this site's images, words, files, designs, and so on.
Feel free to take a few pieces if you are going to display and admire them. I feel good about that.
It would upset me if you took down my art and nobody admired it any more. The cardboard in particular will fall apart if you just leave it on a shelf. If you find yourself storing the art in the garage or whatever, the right thing to do is put it back on the street so somebody else can have it.
"Sharing" is probably the biggest idea in this project. However you relate to my art, I just ask that you be a good sharer, and don't let it go to waste.
Enjoy your art NYC!