Pablo Picasso once observed, “It takes a very long time to become young.” Galleria Continua’s virtual exhibition sees several notable artists reflecting on the concept of time, each with his or her own emphasis or intonation. Some freeze time in a historical event, others try to catch time within a scientific concept. Works come from Ai Weiwei, Kader Attia, Chen Zhen, Berlinde de Bruyckere, Antony Gormley, and others, and make for a fascinating and focused online exhibition. —E.C.