On the Barcelona side streets, you may notice quite a few pixel mosaics from street artist ‘Invader’. The invasion started on the streets of Paris in the late 90’s, and has now spread to at least 35 citys around the globe. Apparently, marking the locations of the Monpellier pieces on a map, forms a large space invader image. Nice.
Image from an interesting article on geek art [weburbanist.com]