'Calçada portuguesa' are traditional Portuguese cobblestones used for pavements, squares, memorials in Portugal, Azores, Brazil and other countries. These cobblestones are the basic element of beautiful forms of urban street art mosaics. When walking down the streets of Lisbon and the Azores, I saw many loose cobblestones. I shifted and rearranged them a bit, piled them up,and created my own urban art structures: calçada monuments, like tiny megaliths, urban menhirs.