The concept of space is just a kind of idea of visual and touchable dots which are arranged. Anything that can't be seen and touched can form the concept of space. Artists have explained the concept for a long time. They analyze all facets freely according to their own visions. They decide their own concept of space whatever subjects they deal. They have freedom to define any kinds of results. If artists regard the world as huge space, and we recognize their ideas possible, we also have to recognize that some parts will disappear by God's unlimited power and other parts will remain. Concepts can be divided by the power of imagination and the divided parts can exist separately. As a quadrangle doesn't mean the same shape in all objects, it is clear that an artist's idea can have different meaning with others.