>>27
Tell me, what makes you so sure that there is no world in which 2 + 2 is 'penguin'? It makes no sense to you or me, but the only reason for this is that we have been taught so. It might make sense to beeings who are wildly different from us, who have been taught that 2 + 2 does equal penguin, and these beeings might live without any problems, too. Just because you do not understand them would not mean that they are wrong.