Well, I've actually thought about that before and in my opinion words are pictures. And, even sound has picture or symbolic shape to it even if we can't see it with our eyes. I'm sure you're probably aware of cymatics? I'm definitely open minded to the possibility that we think in things other than pictures/symbols, but... I'm not very sure or aware of how that might work and I think virtually everything can be reduced to a symbol or a picture or a set of "information", interesting to think about though whatever the truth is!