When technology develops very well and becomes inexpensive enough to prevail in average citizen, it will be used not only for original purpose but for unexpected one. For example, in 1970s, personal computer started to be sold at a low price. Before then, electronic computers was available only to people in academic or research institutions. Due to the introduction of microprocessor, computer was rapidly personalized. And this personalization of computers created new usages of computer such as computer art and music.

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