Thought and speech are inseparable from each other. Matter and expression are parts of one; style is a thinking out into language.
I've always liked artists like Chris Burden, who would take performances, put them in galleries, and then do things that were on the edge.
It would be obvious for me to do conceptual art, and I think I've done it already with smashing bass guitars and whatever - I consider that as conceptual.
The difference between architecture and building is that the former expresses an idea, while the latter is merely a structure built on economical principles. The value of matter depends solely on its capacities of expressing ideas.
I actually don't like this term, "classic." It's wrong, but we don't have a better word at the moment.
Trademarks are usually metaphors of one kind or another. And are, in a certain sense, thinking made visible.
Were a language ever completely "grammatical" it would be a perfect engine of conceptual expression. Unfortunately, or luckily, no language is tyrannically consistent. All grammars leak.
Food can be a material, and you can use it as a way to project concepts.