The existential theme of spatiality may guide our reflection to ask how space is experienced with respect to the phenomenon that is being studied. How do we experience interiorities differently from exteriorities? For example, how is space in a cathedral experienced differently from a small church? What effect do high ceilings have on us? How do we shape space and how does space shape us? For example, how do we experience the bed and bedroom differently when we are healthy from when we are sick? How is space experienced differently from place? How do we experience the worldly or unworldly moods of certain places? How do we enter, dwell, and exit virtual spaces or places of novels, films, or the computer screen? How do we experience the dimensions of cyberspace? Some phenomenological authors regard space and place as the fundamental motifs of their understanding of human phenomena such as Bollnow (1960). Bachelard (1964a) describes the poetics of space, and Casey (1997) describes the historical significances of the phenomenologies of place and space.