 Dretske develops the richness argument slightly differently. He distinguishes between digital and analog ways of encoding information, where the difference between these is analogous to the difference between the way statements and pictures (respectively) encode information. When information that s is F is encoded in digital form (as in a sentence, for example), no extra information is carried in the encoding; but when information that s if F is encoded in analog form (as in a photograph, for example), extra information will usually be carried in the encoding. After explicating the difference between analog and digital encodings of information, Dretske (in his 1981) writes, “The traditional idea that knowledge, belief and thought involve concepts while sensation (or sensory experience) does not is reflected in this coding difference”. Dretske thinks that experiences encode information in the analog way, whereas beliefs encode information in the digital way. This view targets both the same-content thesis, and experiential conceptualism.