I discovered this years ago, when first into painting. I need to have 2, 3 or more paintings on the go at once. This mode is so part of who I am, that if I suddenly find myself not going to the studio (this does not happen often), I realize that I am down to only 1 painting. As soon as I start another, I am happily back at it!
Want to know more about this? Here’s a good article “How JumpingBetween Projects Provokes Creativity” from Creative Something.