Visitors participate in the installation 'Washing Hands' by artists Daan't Sas e Lotte van den Berg, at Base cultural hub, in Milan, Italy, Tuesday, June 15, 2021. According to the press release, the Washing Hands performance is a ritual for passers-by and visitors, who may or may not know each other, to face each other around a sink and wash each other's hands with soap to establish a safe physical contact. (AP Photo/Luca Bruno)