Clay is the cultural common denominator.
Taught a child once who hadn't been able to read. At the suggestion of school advisors, the child's Mom enrolled her in pottery classes. Shortly after a few months of taking weekly clay classes, she began reading and quickly caught up to grade level. Pretty incredible to witness both the reading ability and the lifted self-esteem as the student progressed at her ability to create on the pottery wheel with clay as well.
Healing With Clay