Live projection from your head, as photographed in Vancouver by Da Pang Ro. (Amazing project, by the way, so anyone have any other details?)

We’ve been blogging mobile projection and projection mapping and projection on buildings pretty endlessly. But here’s an interesting question — just how “guerrilla” can you get before your projector gets you in trouble? A reader asks about a project in New Jersey on buildings he doesn’t own, apparently without permission. At what point can the building make you stop — when the light gets in their eyes? What sorts of efforts have been necessary, projectionists, for you to get permission? What logistical issues have you encountered, as far as placement, distance, and power?

If visualists are to take over the world’s architecture, we’d better have a plan. Open thread begins … now.