The "Sakuteiki" describes different kinds of artificial island which can be created in lakes, including the "mountainous island", made up of jagged vertical rocks mixed with pine trees, surrounded by a sandy beach; the "rocky island", composed of "tormented" rocks appearing to have been battered by sea waves, along with small, ancient pine trees with unusual shapes; the "cloud island", made of white sand in the rounded white forms of a cumulus cloud; and the "misty island", a low island of sand, without rocks or trees.