This is more of a Movement:
Ab/Ab-D/F-Bb-D
G/G-Db/G-Bb-Eb
Gb/Gb-C/Eb-Ab-C
F/F-B/F-Ab-Db
So basicaly you're taking the tritone in your Left hand and going down half steps,
while playing fourths in your right(BbMaj, EbMaj, AbMaj, DbMaj, etc.)
You're really just playing 7th Chords.
Ab-D/F-Bb-D Bb7
G-Db/G-Bb-Eb Eb7
Gb-C/Eb-Ab-C Ab7
F-B/F-Ab-Db Db7