This illustration book is the interpretation of a very basic shape, "the circle" in a very personal perspective of myself. The circle is one of the most symbolic and abstracted shape in both visual and historical. The circle represents vast meanings. To me, the circle is the shape that works inside my mind and thoughts. The circles mean something internal, metaphysical values rather than something outward and concrete. Based on the idea, I design the illustration of each definition of the circle inside me using only the simplest line and shapes to make the illustrations to be seen as the from of the structures of people’s mind and ideas.