The basic idea behind this theoretical extension of the notion of inscription is the indifference of de sign-function to the material instantiation of the sign. This arbitrariness of the medium of the sign holds for the signs not only with regard to their communicative capacity, but also with regard to their function in logical operations. As Paul of Venice points out, in principle it would be possible to form syllogisms or to draw conclusions by using sticks and stones instead of words or sentences (… possemus cum baculis syllogizare et cum lapidibus concludere) (Paul of Venice, Logica magna, prima pars, Tract. de terminis, 1979, 78). The fact that we, in general, do not do so, and that we do not communicate by means of sensible qualities like warms or smell, but rather use vocal or written terms in the strict sense, is only due to their greater operability (Paul of Venice, Logica magna, prima pars, Tract. de terminis, 1979, 78).[61] For we can utter articulated sounds whenever we want to but cannot produce with the same ease and distinctness the possible objects of the other senses like certain colors or smells.[