Writing originated as pictograms but evolved to become more phonetic over time. Early writing systems included logographic scripts like Sumerian cuneiform and Egyptian hieroglyphs which represented morphemes and words. Later, the rebus principle was developed where symbols began representing sounds, moving towards syllabic scripts. The Phoenician alphabet was adapted by Greeks to create a true alphabet representing individual phonemes, which was then adapted by Romans. Runic writing also developed as an offshoot of early European scripts.