climates discovered great new resources of personal energy. 
New means of heating permitted the manufacture of glass and 
the enlargement of living quarters and the raising of ceilings. 
The Burgher house of the Renaissance became at once 
bedroom, kitchen, workshop, and sale outlet.

     Once housing is seen as group (or corporate) clothing 
and heat control, the new means of heating can be understood 
as causing change in spatial form. Lighting, however, is almost 
as decisive as heating in causing these changes in architectural 
and city spaces. That is the reason why the story of glass is so 
closely related to the history of housing. The story of the mirror 
is a main chapter in the history of dress and manners and the 
sense of the self.

     Recently an imaginative school principal in a slum area