Generic List of Generic Interfaces not allowed, any alternative approaches?

Question

I am trying to find the right way to use a Generic List of Generic Interfaces as a variable.

Here is an example. It is probably not the best, but hopefully you will get

Answer 1

public interface IPrimitive
{

}

public interface IPrimitive : IPrimitive
{
     T Value { get; }
}

public class Star : IPrimitive //must declare T here
{

}

Then you should be able to have

List primitives = new List;

primitives.Add(new Star());   // Assuming Star implements IPrimitive
primitives.Add(new Sun());    // Assuming Sun implements IPrimitive