When I was there, there was a short line to use it, so after I learned it was a special toilet, I just got in line. I try not to poop in public toilets as a rule, but this seemed like the ideal exception to make.
E: also, it’s a real shame that you weren’t allowed to use it, as use was the primary intention of the artist. I googled it to make sure I wasn’t misremembering…
Its participatory nature, in which viewers are invited to make use of the fixture individually and privately, allows for an experience of unprecedented intimacy with a work of art.