Building on what is available as an outdoor leisure in urban space:
Safety is an issue in setup;
Multiple layers of engagement after drawing someone into the location to interact with it, how do I make people dwell a little longer? How much privacy shall it give to encourage different types of people who want to interact less? ;
Aesthetics: even when the work is in progress, it is designed to look aesthetically photogenic and interesting, the process of setting up leads up to the opening of the show.