How often are spontaneous, primitive, radical actions implemented in large urban centres? Siempre Fiesta (or Always Party) by Andrés Carretero and Carolina Klocker was recently voted by the We-Traders community as their favourite in the recent Open Call Madrid competition. Viewing the city through children's eyes, where the order of the day is primarily playing or making, and using the concept of "free movement of our body in space" as a key driver, Carretero and Klocker developed a playful scheme that proposed filling a niche in Madrid's urban grid with sand as a way of managing the environment to create "comfortable space."