A thought-provoking art project in Italy’s Milan saw people hitting tennis balls right under the ancient relics and frescos of a 16-century church. The US artist behind the art experiment dubbed his exhibition “Untitled (plot for dialogue).”

The playground has been installed in Milan’s Chiesa San Paolo Converso, a former Roman Catholic church currently used as an exhibition space. Organized by American artist Asad Raza, the project allows visitors to take racquets and play, or just observe the game in front of the old stone statues and paintings.