In Plato's Parmenides, Parmenides asks young Socrates whether certain objects are forms. Socrates says that
1. there are forms of likeness and unlikeness, multitude and oneness, rest and motion
2. there are forms of justice, beauty, and goodness
3. he is not sure whether there are forms of human beings, fire, and water
4. there are not forms of worthless things such as hair, mud, and dirt.