I also went to the Museu d'arte Contemporani de Barcelona, and walked on broken glass:
This is Cildo Meireles and his instalation, which I very much enjoyed. I had to sign a waiver before I walked inside it.
Before that, there was a room. A red room. All red. White walls, white light.
It might make you go mad.
A sink, running red liquid·blood
with which to paint the room.
With which to paint everything.
Photo credits: Leitura Favre, Maria Gimenez