No Knight Presence

But that could be a (half) Bishop on the left or maybe a Pawn. As for the piece on the right, it could be a King/Queen fusion sort of thing.

Art on Park Ave Chess Pieces © Flickr user J J under Creative Commons.

The description said,

Night Presence IV • This sculpture of welded Cor-Ten steel was given by Louise Nevelson to the City to commemorate her 50th year of living and working in New York. Said Nevelson, "New York represents the whole of my conscious life and I thought it fitting that I should give it something of myself."

Other sources say the gift was made in 1973. Nevelson's Wikipedia page, Louise Nevelson, says,

Louise Nevelson (1899–1988) was an American sculptor known for her monumental, monochromatic, wooden wall pieces and outdoor sculptures. Born in the Poltava Governorate of the Russian Empire (present-day Ukraine), she emigrated with her family to the United States in the early 20th century.

For more about the sculpture, see Night Presence IV, Not Present (full-stop.net), where the word 'chess' isn't mentioned. The game doesn't appear to have had much additional influence on Nevelson's work.