Ideation as function of human language

Ideas are human creations and, as linguistic phenomena function at several levels of human language. Karl Popper, the philosopher (1902-1994), talks about higher and lower functions of language. Accordingly, the lower functions of language are self-expression and signalling whereas the two most important higher functions of human languages are the descriptive function and the argumentative function. Popper holds that the lower two functions are always present when the higher ones are present. Now, if relating Popper's line of thought to ideation, one might say that idea generation corresponds to self-expression and signalling whereas idea communication compares to the descriptive function and the argumentative function. That is, designers generate ideas (self-expression) and communicate ideas (descriptive function and argumentative function). And so, both the descriptive function and the argumentative function are present in idea communication. Moreover, both the lower and higher functions of human language are present in the ideation process, which is mainly instrumental. That is, self-expression is always present in the idea argument also reflecting that ideas may always be replaced by other ideas.