Our research work introduces us to the subject of the Fear in Homer, which meant the panic escape from the field of battle, that is, from a Space where death is lurking, and then reveals that in Greek Mythology, Fear dominates. The first chapter makes a separation of Fear and Phobia, giving the first the definition of the necessary defense mechanism for survival, and the second the persistent attachment to a fear that creates a pathological condition. Then acrophobia, claustrophobia and agoraphobia are examined as fears that develop into phobias, linked to the three dimensions of space. The same emotion is then sought through the opposing dipole of transparency - opacity and light-darkness, and then it is found that by extending the boundaries of space within the organized place, a geography is created that includes the social groups that have frightened the whole. In the final chapter, the Farnsworth House example is described as a transparent home that terrorized its owner due to its direct contact with external threats and the loss of its privacy. Finally, six conclusions are drawn regarding the relationship of fear and space, and it is noted that all design attempts that will host life, should use fear as a tool that will protect the inhabitants.