The use of bicycle sharing systems can be seen in this objet d’art using data collected from three cities: New York, London and Rio de Janeiro. The pulse of urban mobility is revealed, creating portraits of cities defined by their momentary dynamics. The piece presents three screen modes with the visualization of rented bicycles but focusing on different levels of the spatiality and temporality of this type of mobility. The panoramic view of each of the cities aggregates all the trajectories of shared trips of bicycles occurring  within a single day.  Another view shows only the "to" trips of a particular station. The third viewing mode shows the space/time averages for three bike stations, separating arrivals and departures for evening/night time rides.