  If the symbols exist, then they exist where? (In case of alphabets, if I want to be painfully philosophical, I may be tempted to say that the alphabets exist in some "imaginative world" of my mind - which will in this case be "collection".)  Is it even meaningful to ask 'where the symbols exist'?  I think that it is necessary to have a Theory of Collection because the phrase "[w]e have some symbols" is very much vague. Consider the following question for example,  