21.   The works by Ms. Sherman do not always show the artist at her best.

22.   They show an artist working ahead of his time, moving toward a future that he would never reach.

23.   They show the artist tackling bright, off-key colors, scaling up the size of his canvases and experimenting more with the effects of light.

24.   They show the artist grimacing and frowning, as if mugging for the camera.

25.   A self-portrait showed the artist calmly painting the remains of the museum, which lies in rubble.