In Lisbon, a Carpet of Stone Beneath Their Feet A calçada, or patterned pavement, of the fado singer Amália Rodrigues was a collaboration between the artist Alexandre Manuel Dias Farto and master pavers, including Jorge Duarte. It is in the Alfama section of Lisbon. Credit Rodrigo Cardoso for The New York Times A calçada, or patterned pavement, of the fado singer Amália Rodrigues was a collaboration between the artist Alexandre Manuel Dias Farto and master pavers, including Jorge Duarte. It is in the Alfama section of Lisbon. Credit Credit Rodrigo Cardoso for The New York Times LISBON — As Portugal lost its colonies around the globe, the country’s nearly six centuries of influence ensured a legacy of distinctive decorative style: delicate filigree jewelry, colorful azulejo tiles, intricate wrought iron work and black-and-white patterned stone sidewalks and praças, or plazas. Those limestone surfaces are pedestrian objects in more ways than one: