Volatilization
  1. Rebus  2. Rock  3. Talk  4. Phemus   1. Rebus  Writing systems that arise de novo, such as Egyptian hieroglyphs, Sumerian cuneiform, and ancient Chinese script, tend to use complex logograms. These symbols represent words through a combination of semantic and phonetic content.     These scripts are cumbersome. They are difficult to learn because you have to separately learn the symbol for each individual word; although there are elements that are shared between logograms and that indicate roughly the same thing, many logograms are partially or completely opaque: just by knowing about the shared elements, you can't necessarily predict what the full logogram will be for a word, and you can't necessarily understand what word a novel logogram is representing.  On Chinese logograms:    https://en.wikipedia.org/wiki/Chinese_character_radicals  On Egyptian logograms:   https://en.wikipedia.org/wiki/Egyptian_hieroglyphs#Writing_system  These scripts also don't have a natural o...