The form of roundness can be found in many particular spatial locations, and even if all round objects were destroyed, the property of roundness would still exist. The forms are also pure . This means that they are pure properties separated from all other properties. These are all put together to make up this individual basketball. A form is just one of these properties, existing by itself apart from space and time.
Roundness is just pure roundness, without any other properties mixed in.
The forms differ from material objects, then, in that they are transcendent and pure, while material objects are complex conglomerations of properties located in space and time. To see how forms are related to material objects, we need to look at the other four properties that characterized the forms. The forms are the archetypes or perfect models for all of the properties that are present in material objects. The forms are the perfect examples of the properties they instantiate. The material world is really similar to the more real world of forms.