Although there is no such thing as an intuitive icon, it is sometimes possible to use icons that relate to experience, and it is generally possible to make icons mnemonic, so that they don't have to be explained more than once. Note that the common icon for saving a file in GUIS for Linux, Mac, and Windows is the obsolete floppy disk. A billion people have learned it, so it has become almost unchangeable. We have started over in Sugar.