In a great work of art, the artist's hand is invisible. Not so in the traveling exhibition "Revealed," which shows famous artists at work in their studios. The series of nearly 40 photographs has been culled from the archives of the French weekly magazine Paris Match by Pablo Picasso's grandson, Olivier Widmaier Picasso.

The pictures are showing in lobbies and other public spaces at Sofitel hotels in five cities, beginning in New York and ending in Beverly Hills next April. In between, the exhibit will be in Washington, D.C., Chicago and Montreal.