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Such profound concepts as motion , identity , and continuousness were part of this background and therefore the models which rely on these concepts are universally true not only for real experience but also for any construction the imagination is capable of creating . They rely on these concepts to identify themselves as ecologists , but since they are taking each concept out of context , they run the risk of distorting it and of being rejected by the disciplines that fathered the concepts ( which is not to imply that natural ecology has not made significant borrowings from the social sciences ; see for example the discussions in Rapport and Turner 1977 and Richerson 1977 ) . To do this , Ayanna and her colleagues rely on two concepts in the field of artificial intelligence : ' fuzzy logic ' and ' neural networks . Instead they rely on older concepts . To develop a less rigid theoretical model of culture , this paper will rely on two concepts first proposed by Hannerz ( 1969 ) and subsequently clarified by Swidler ( 1988 ) . The increasing prominence of arguments for the existence of God which rely on these concepts – both in academic philosophy and in public life – indicates the importance of this project . Some of the approaches used by HTML-oriented tools ( like many on CPAN ) are not exactly designer-friendly : They rely on programmer-friendly concepts such as abstract data structures , miniature programming languages , " catch-all " pages and object-oriented techniques such as method dispatch . Three of those four strategies rely on value-based concepts .