Their attention is captured by looking at all of their surroundings in plain sight and thinking about what they might do to change it. They invent the possibility of making a change. The invention is informed by prior experiences in using similar material objects, but the evaluation of potential complications and side-effects are not considered. They often, however, ask an authority figure for permission to carry out the invention. When the change is complete, they are usually proud of the discovery of a change that they invented.
The added visual motor cue within ACL 4.6 is the capacity to overlap material shapes. Within ACL 4.2, they layer one whole shape on top of another. Within ACL 4.6, they can overlap the edges.
In this picture of felt projects the overlap is on the leaves and stem of the tomato potholder, which is usually done with ease, within ACL 4.6. The flower, stem and leaves on the eye glass case are examples of how close layering (ACL 4.2) can come to overlapping. I follow the patient's lead in making the differential. I think the reason that people within ACL 4.2 can do the flower, stem and leaves is they are so stereotyped and simple in the design.
The nature of the change is usually a very simple change in a striking visual cue that has a child-like quality. Some people find their pride endearing, while others regard it as annoying. The situation can have serious consequences when they think their invention is worth a lot of money, but in fact is done by many pre-school children.