Вспомнил песенку с детской книжки по английскому 1992 года. Что имеется в виду под "dolls on balls" в 4-м куплете?

This is a cat, cat, cat
It's under the mat, mat, mat
These are cats, cats, cats
They are under mats, mats, mats

This is a bear, bear, bear
It's under the chair, chair, chair
These are bears, bears, bears
They are under chairs, chairs, chairs

This is a fox, fox, fox
It is in a box, box, box
These are foxes, foxes, foxes
They are in boxes, boxes, boxes

This is a doll, doll, doll
It is on a ball, ball, ball
These are dolls, dolls, dolls
They are on balls, balls, balls

Песенка из книжки My Home Л. В. Компанийцевой, запись №2