Currency/Permanency Unity charts a range of the humanmade, as a function of size and fixedness versus resource and configurability.
Larger more fixed expressions are charged with more inclusive and general expressions, more adaptable assemblies, accounting for energy investment within a completed project, that it be “reusable/repurpose-able” in perpetuity. Concrete might be justified with a certainty of reuse of the shell/envelope/structure in place. Smaller and unfixed expressions are permitted greater density of uniqueness both in expression and material value/impact which at the smallest scale become analogous (or literally same as) held coinage.
s m a l l c h i t e c t u r e supposes a sum target 1 of the two complimentary gradients as an imprecise, yet meaningful, ideal which allows a freedom of expression relative to constraints of sustainability, and opportunities of expressive (and material) value.