These is classified here as a type of interpretative code. Some semioticians regard sensory perception as a code. Various arguments are encountered, in particular: a) that interpretation cannot be separated from perception; b) that human perceptual apparatus differs from that of other organisms and so presumably different species inhabit different perceptual realities; and/or c) that even within the human species, that there are socio-cultural, sub-cultural and environmental differences in perception.