And some, with a bit of evolution, could "conceivably" be written characters. Take for example jottings like < img src = ".. / Wordgif / fba4.GIF" border = "0" >. It is clearly depictive, and it seems possible to guess the meaning.
如「」這樣的文字，已經很形象化了，似乎誰都可猜猜它的意思。