A video-game creature in London warns us that spy cameras are everywhere in public spaces. It's almost as if the proliferation of CCTV cameras were the real "Space Invaders," intruding into our lives whenever we go outside and subjecting us to intense scrutiny that might as well be a rain of laser blasts. The Space Invaders graffiti, using tiles to simulate 8-bit video game pixels, has been a constant in London since 1999, but it seems to have started featuring the CCTV warning only recently. Click through for a couple more images.

[Space Invaders on Flickr]