It started just east of Paris in Montreuil office park, where video game company Ubisoft made a space invader Post-it mosaic on their office window. The folks at BNP-Paribas bank, whose offices face Unisoft, struck back with a bigger, badder Post-it creation.
Thus, the war began.
It has spread to business areas around Paris, to small offices, shops, and restaurants. The Post-it installations range from simple flowers to 3-storey creations, and have replicated the high-brow (Mona Lisa) and the pop culture (Angry Birds).