4) The peace cube represents a long period of peace during which our progeny will evolve into the ultimate posthumans. The peace symbol (http://en.wikipedia.org/wiki/Peace_symbol#The_peace_symbol) was originally created for the Direct Action Committee Against Nuclear War. The posthumans will create a paradise on Earth and this may be the end of their evolution. If necessity is the mother of invention then invention may stop at a certain point since all needs will be met or they may seek the fundamental answers to all of existence and go on to the next stage of evolution.
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