This chord is much more similar to an example of close harmony than the open voicings that I posted earlier. Close harmony is essentially the opposite of open harmony. The notes are often clustered together and might include minor seconds. This example could be written, once again, as a poly chord or by referencing the notes used. I tend to think of it as a poly chord because In the left hand I’m playing an incomplete B flat major seventh made up of B flat, F and A, followed by a C major triad in the right, starting with the G below the A in the left hand. This means my thumbs are crossed leaving me in a good position to play arpeggios around the C triad.
Rhodes Chord B Flat Major 7 (b5) Poly C over B Flat 7