He has created panels, figures and objects from nature as elements for mixed-media installations that include architecture, water and landscapes.

In terms of art, the most arresting achievements at "Montage 93" are several mixed-media installations that incorporate video, not such a new idea but a good one.

There he discovered the video camera, which allowed him to add movement, special effects and a theatrical dimension to his mixed-media installations.

It is a mixed-media installation, consisting of a derelict ship on the lake and a guardhouse and its equipment on the shore.

Another sculpto-pictorama, Ruckus Manhattan (1975) exemplifies the mixed-media installations that would become his signature craft.

Mr. Marshall's step into the realm of mixed-media installation could be an unproductive detour or a fruitful expansion.

Some sculptors combine various materials to create mixed-media installations.

Most others have opted for assorted mixed-media installations.

It is a partnership better known for its mixed-media installations and performance pieces than for brick and mortar.

"Speed of Vision," videotapes and mixed-media installations, through Sept. 6.