[vimgrinder]

I like the idea of "concept" .. you can represent a concept with language, visual etc. but it isn't any of those. Those are symbols used to communicate a concept or give representation to it but concepts are just connections between other concepts at the core. The closest things i feel to this is categories in category theory.

[layer8]

Concepts need to be linked to reality somehow in order to carry any meaning. They are thus not just relations between themselves.

[dr_dshiv]

Platonic forms?

[attentionmech]

interesting concept they are.