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Recently there has been a resurgence of murals in several European and American cities. Street art visual practices have privileged murals as one of the most suitable formats to address public spaces. Despite the increasing recognition and significance of murals for the visual culture of these cities, this contemporary urban art practice has not received much attention from recent literature. This paper provides a literature review on contemporary murals, giving an account of their popularity, their relation to location-specificity and global presence, as well as the means of dissemination of such art expression. The study will then focus on a set of case studies in Lisbon, regarding the paradigmatic shift from sculpture commissioning to mural commissioning within Portuguese Brazilian cultural relationships. The works of OSGEMEOS, Bicicleta sem Freio and Nunca will be discussed in this framework, questioning what the contributions of contemporary mural works might be for the public spaces of the city.