I heard about this on NPR. He's been doing it (with interesting results) for quite some time. Here's a story on the one he did a few months ago in Venezuela.
What a beautiful day in Mexico! As the L.A. Times put it, it was a "say cheese" moment.
Hi,Spencer will be in Amsterdam next Sunday AM doing an installation for Dream Amsterdam. For more on Spencer, including his lesser known individual portraits, and accounts by thoose of us who participate, including some from the recent Mexico installation, come to http://www.spencertunickforum.orgRoger