Much of the circle is missing yet we are willing to accept it as whole. The circle is called a subjective circle . Think of it as being subject to how much of the circle is visible. If you see too little, the circle ceases to exist. If you see too much, it becomes non-subjective .
Subjectivity lies somewhere in the middle.
It's as if our brain were using mind cement to add missing parts of an object in our mind's eye.