I’ve heard about PhotoSynth, Microsoft’s rather cool technology for placing photos within a 3D space, but this Photosynth demo by its architect Blaise Aguera y Arcas is truly impressive – listen to the gasps from the audience as the penny drops on what they are seeing.

I’d love to throw it at some Geograph squares – some of the more touristy squares have oodles of PhotoSynth fodder.