Or some back-and-forth thing. That’s what I do with my hands. I feel like a juggler at the piano. I write 16 measures of left hand, then put something over it. Then I wrote 16 measures of right hand and put something under it.
This can get weird when the hands seem to want to modulate in separate streams. I just had to thumbwrestle (almost literally) when my right hand insisted on going into Db, and when I tried to put a left hand beneath it, my left hand wanted to go to Gb. Gagh. Fight it out, guys. Me and Colin “Bomber” Harris.