I play with the squishy pillow a lot, as do my littles. We hug it, slam it on our lap out of anger, 'brush it down' with our fingers, poke the corners into the pillow, flip it in the air, and so on. I suppose it shows my mood.
Hug = insecurity
Slam = anger
Brush = dissociative
Poke corners = trying to avoid focus
Flip in the air = nervousness