[Dimensio]

Actually, that's a common problem with the argument that design is inherent in the universe (an ID argument that I've heard more than once). When asked for examples of something that is "not designed" so that we may use it as a reference for comparsion, they either balk or throw up "theoretical" examples that lack any useful detail and, because they are only theoretical, have absolutely no useful value as evidence.

[general_re]

I'm not sure how you could avoid either simple tautology or somewhat more complicated circular arguments in that case, though.

A: Everything was designed.
B: Okay, how do we know that?
A: Everything shows evidence of design.
B: What evidence?
A: (...)
B: And how do we know that's evidence of design?
A: Because everything was designed.

...and so forth.