The speed with which architecture changes can be seen in more than just the stylistic developments which quickly follow one after the other. If you look at the architecture of the 1960s or 1980s it is easy to see a world of difference from today. The fast pace of change can also be seen in the massive developments in terms of the comfort level of buildings. Here as well, the space of a century brings countless changes, and often enormous innovations will take place over a decade. How long ago was it the norm to have single glazed windows? It took an oil crisis and an increase in the price of fossil fuels in the early 1970s before double glazing started to become popular. The gradual increase in popularity for triple glazing is an even more recent development.