I remember reading this somewhere when you ask a child to color something, she would happily pick a crayon and start coloring. She'd go out of the lines, fill the picture with colors from her weird imagination. You'd see blue elephants, red fields, and orange oceans. As she grows up people start molding her. They will want the child to color within the lines and see things they way they are - elephants are supposed to be grey, fields: green and oceans: blue.