 Witkin’s works at this time were in the style of formalist abstractions, moving from the fiberglass and wood of his earlier works to heavy welded steel industrial structures with complex Cubist compositions.These were well received in America, notably during a 1966 show at the Jewish Museum, in New York City, and various other showings in that city thereafter.In 1976 Witkin was the subject of a PBS documentary, "Sculpture by Isaac Witkin", directed by Neal Marshad.