Click the box(es). Press on the boxes, and release outside the boxes. Press outside the boxes, and release inside the boxes.
While developing a library to support these abstract relationships, I made a conscious choice to restrict myself to ‘pre-existing’ form; while the system should theoretically be used with any quantifiable value, I was not concerned with developing any methods for generating form. (Though I would investigate this possibility later in my drawing studies.)
To compensate I’ve found working with a set number of primitive, overlapping, black and white forms to at least begin to allow for the construction of the kinds of novelly transformable visual forms created by computationally based parametric structures.