Crossing the midline—when a child uses one part of the
body in the space of the other part—is an activity that
requires good bilateral communication. Picture a child
playing a drum with both hands, passing a maraca from
one hand to the other, dancing the Hokey Pokey (putting
one leg in and one leg out). Teachers can also hold an egg
shaker in a way that requires babies to reach across their
bodies to grab it.