When it is all said and done, this film represents the high watermark of European Art Cinema in its impact in American culture. Luckily, the product still holds up. The two key ingrediants are Marlon Brando’s heartbreaking and unpredictable performance and Vittorio Storaro’s framing and use of camera movement. The greatest portrait of grief on film (“Mystic River,” for all its noble and remarkable performances will always be marred with the contrivance of plot), “Last Tango” leaves you emotionally drained, shaken, puzzled. The people in this movie behave like people in our world. Also — Maria Schneider’s large, pendulous breasts and prodigious bush make for a startling, recurring image.