All human action is expressive; a gesture is an intentionally expressive action. All art is expressive - of its author and of the situation in which he works - but some art is intended to move us through visual gestures that transmit, and perhaps give release to, emotions and emotionally charged messages. Such art is expressionist.

All human action is expressive; a gesture is an intentionally expressive action. All art is expressive - of its author and of the situation in which he works - but some art is intended to move us through visual gestures that transmit, and perhaps give release to, emotions and emotionally charged messages. Such art is expressionist.

A great artist is never a closed subject, but this catalogue is a milestone production, as useful as it is beautiful.