The very brief Conflux Festival is over, but its MoMA invasion carries on. Uninvited, and possibly unwanted, the installation of augmented artworks into MoMA will become a common occurrence for cultural institutions. All you need is the location's coordinates.
A colleague was just reminiscing about an old-school example called "Stealth Bomber". The artist, Thomas Deverall, built a small black bomber out of cardboard and personally installed it in the National Gallery of Victoria here in Melbourne. It was eventually removed by staff, but the card remained for some time. There's a long history of artists raiding galleries and museums, but I suspect AR will be near impossible to block or remove. Other examples welcome via comments.