Last month I saw Nokia champion Jurgen Scheible present Mobispray at Nightmarket 2008. He uses a cell phone to paint graffiti on anything through a multimedia projector. The real-time interaction is guided through a custom interface on a (of course) Nokia phone with an accelerometer to place and rotate dabs of virtual paint. It’s a full-featured version of GRL’s L.A.S.E.R. Tag. You can watch him in action painting military aircraft among other things on Youtube and below: