ends would be (e and f), he figured out how to add them and we talked about how they could equally be attached to any of a, b, c or d.
once he the basic idea set in his head, i introduced other shapes. first i got him to sketch the plan, no ruler and no measuring so that he would get the image from his head onto paper without worrying about the details. we then talked about how we could make it into a solid object and that it would need flaps to hold it all together. he already had an idea about this from doing the magic box from 