Forms of artistic expression, part 1

Sophia has been painting in preschool. Amazing stuff, very abstract, but very consistent in form and colour. Random splotches in abstract art are one thing ("my three-year-old could do") but she routinely repeats colour forms and patterns, and often creates a series of two or three related works. Here is her current set (we have a wall for these things) along with a close-up of each. Particularly look at the first two for a good example of a pair of related works...