Mary, Mary, quite contrary,
How does your garden grow?
With silver bells, and cockle shells,
And pretty maids all in a row.
Have you ever wondered what cockle shells look like? They look more like Native American clay pots to me; but this wild flower isn't even native to the Americas but it is interesting and beautiful after all.
The cockle shell is full of tiny seeds about the size of a poppy seed. The shell itself is a sturdy little container.