The whole space contains forms and all forms occupy space. Yet all negative forms become invisible in the presence of the positive. Again every positive form becomes negative in the presence of a still more radiant one. For instance if there be a blazing fire in a room, we practically notice nothing else, no matter how many objects there may be because our eyes are attracted by the radiance of the fire. In the same way, if there be any bright objects in the room our eyes are attracted to them before anything else in the room. The objects as we see them we believe them to be, that which owing to the limited power of our sight we cannot see we say does not exist, but that there is only an empty space. Therefore if anybody happens to see any such forms which are not visible to all, people at once begin to accuse him of lunacy.