The way I work in Procreate app is to put something down, a shape or color, and build on it without a lot of forethought as to where it will end up. In that sense, these are all improvisations. They develop by a kind of accretion, adding (and deleting) bits and pieces to form a final image. Working digitally allows for freely changing colors and textures as well as repositioning elements in layers to build the composition. These abstractions, though individual in content, all have this free wheeling spontaneous process in common.